For thousands of generations, a hidden chamber
beneath the limestone cliffs of Gibraltar remained locked away from the outside
world. Its entrance had been buried beneath ancient sand, protecting whatever
lay beyond from the changes taking place above.
Then, in 2021, archaeologists finally broke through.
What they discovered was more than an unexplored
space in an ancient cave. Inside were animal bones, evidence of prehistoric
activity, and a sea snail that may reveal something surprisingly familiar about
the people who once occupied the site.
The discovery has become an important part of a much
larger scientific investigation into Neanderthal
intelligence, prehistoric human behaviour, and the evolution of symbolic
thinking.
The chamber is part of the famous Gorham’s Cave Complex
in Gibraltar, a UNESCO World Heritage site where researchers have spent decades
investigating evidence of Neanderthal life.
And the newly opened space may only be the beginning.
The team believes the chamber forms the upper part of
a much larger cave system, with enormous quantities of sediment still waiting
to be investigated. If that material preserves further evidence, it could help
answer questions about how Neanderthals lived, what they ate, how they made
tools, and how long they survived in southern Europe.
But the most remarkable discoveries are not limited
to the sealed chamber. Elsewhere in the same cave complex, researchers have
uncovered evidence of sophisticated adhesive production, deliberate engravings,
coastal food gathering, and possible symbolic use of feathers.
Together, these findings are challenging one of the
oldest assumptions in popular accounts of human evolution: that Neanderthals
were intellectually inferior to modern humans.
Gibraltar: The Place That Changed
How Scientists Understand Neanderthals
The Gorham’s Cave Complex sits along the eastern side
of the Rock of Gibraltar, where enormous limestone cliffs overlook the
Mediterranean Sea.
It consists of four important caves: Gorham’s Cave,
Vanguard Cave, Hyaena Cave, and Bennett’s Cave.
Their entrances were originally shaped by the sea,
but their archaeological importance comes from what happened after the water
moved away. Over thousands of years, sediment accumulated inside the caves,
preserving evidence of animals and human activity from different periods.
In July 2016, the complex received UNESCO World Heritage status,
recognising its exceptional importance for understanding Neanderthal occupation
and prehistoric life.
The history of archaeological discoveries here
stretches back much further.
In 1907, Captain A. Gorham discovered a passage at
the rear of one of the caves and left his name and the date on the rock.
Earlier archaeological work had already begun establishing the importance of
the area.
Between 1947 and 1954, archaeologist John Waechter
excavated Gorham’s Cave, uncovering evidence of repeated occupation extending
back more than 100,000 years.
Yet Gibraltar's importance in Neanderthal research
goes back to the nineteenth century.
In 1848, an adult Neanderthal skull was discovered at
Forbes’s Quarry on the Rock. At the time, scientists did not understand exactly
what they had found.
Eight years later, another skull was discovered in
Germany's Neander Valley. That discovery eventually helped establish the
scientific identification of Homo
neanderthalensis in 1864.
Only after the species had been recognised did
researchers fully appreciate the significance of the earlier Gibraltar skull.
Charles Darwin later examined it and described it as
remarkable.
Then, in 1926, archaeologist Dorothy Garrod
discovered another Neanderthal skull at Devil’s Tower, near Forbes’s Quarry. It
belonged to a child estimated to have been around four years old.
For generations, the Rock of Gibraltar has provided
evidence about a human relative whose abilities and behaviour scientists are
still trying to understand.
The discovery behind the ancient sand barrier added
another extraordinary chapter.
The Hidden Chamber That Remained
Sealed for at Least 40,000 Years
The excavation that eventually exposed the chamber
was led by Professor Clive Finlayson and researchers associated with the
Gibraltar National Museum.
Their work in Vanguard Cave began in 2012.
For years, the team carefully removed layers of
sediment, gradually moving deeper into the cave. Archaeological excavation
requires patience because every layer can contain evidence about a different
period in the past.
Then, in August 2021, the researchers reached an
obstruction at the rear of the cave.
It was a thick deposit of ancient sand.
Beyond it was an unexplored chamber.
Once the team cleared the barrier, they discovered a
space extending approximately 13 metres into the rock, with stalactites hanging
from its ceiling.
The dating of the sand indicated that the passage had
been sealed for at least 40,000 years. The chamber itself could be considerably
older.
The significance is difficult to overstate.
Around 40,000 years ago, the world was in the Upper Palaeolithic period.
Agriculture had not developed, permanent cities did not exist, and written
records were still thousands of years away.
The people who last entered the chamber belonged to a
very different world from our own.
The discovery also provided something archaeologists
rarely encounter: a space that had remained largely protected from later human
activity.
Natural sealing can preserve delicate evidence that
might otherwise be destroyed by erosion, animals, or repeated occupation.
There was another surprise.
Researchers identified evidence suggesting that an
earthquake had affected the chamber approximately 4,000 years ago. A formation
from the ceiling appeared to have broken away, while newer stalagmites had
subsequently developed beneath the damaged area.
Even though the chamber had remained inaccessible,
geological changes continued inside it.
Professor Finlayson also suggested that the newly
exposed area was not simply an isolated room. It appeared to form part of the
roof of a much larger cave containing substantial sediment below.
In other words, the excavation may have revealed only
a small portion of what remains underground.
The Sea Snail That Revealed a
Neanderthal's Everyday Life
Among the discoveries inside the chamber were animal
remains, including bones associated with a lynx, a hyena, and a griffon
vulture.
Researchers also identified long scratch marks on the
cave walls, apparently made by a carnivore that has not yet been conclusively
identified.
These findings provide clues about the animals that
entered or occupied the space.
But one discovery stood out for a different reason.
At the back of the chamber, the team found a large
whelk, an edible marine snail.
It was not the sort of object that would naturally be
expected deep inside a limestone chamber.
The shell was found approximately 20 metres from the
beach, according to the research team's account. That raised an important
question: how did it get there?
The most straightforward explanation is that someone
carried it inside.
Given the archaeological context and the age of the
sealed deposit, researchers have linked it to Neanderthal activity.
It may seem like a small detail, but it offers a
fascinating glimpse into prehistoric
food gathering and Neanderthal behaviour.
The shell suggests that the cave's occupants were not
simply surviving on whatever animals happened to appear nearby. They were
capable of collecting resources from different parts of their environment and
transporting them back to sheltered locations.
That is an ordinary activity today. In the context of
Ice Age archaeology, however, it helps researchers reconstruct how Neanderthals
used their landscape.
The chamber also contains a more disturbing
connection to prehistoric life.
Nearby excavations had recovered a Neanderthal milk
tooth belonging to a child estimated to have been around four years old. The
tooth was found among remains associated with hyenas.
Finlayson has suggested that a hyena may have carried
the child's remains into the cave, although the precise circumstances cannot be
established from the tooth alone.
The discovery is a reminder that Neanderthal life
involved the same basic realities that shaped other human communities:
childhood, family relationships, food gathering, danger, and loss.
The popular image of Neanderthals as emotionless
prehistoric brutes becomes increasingly difficult to reconcile with the wider
archaeological evidence.
The 60,000-Year-Old Technology
That Required More Than a Simple Fire
The sealed chamber is remarkable, but another
discovery from Vanguard Cave may be even more revealing about Neanderthal
technical abilities.
In 2024, researchers reported evidence of a possible
prehistoric tar-production process dating to approximately 60,000 years ago,
with some estimates placing it closer to 65,000 years.
The research, published in Quaternary Science Reviews
in November 2024, described a small pit discovered in the cave sediment.
Inside were traces of charcoal, pollen, chemical
remains associated with resinous plants, and small yellowish materials
interpreted as possible tar.
The study involved researchers from several
countries, with the Gibraltar National Museum working alongside scientific
institutions including the University of Murcia and the Andalusian Institute of
Earth Sciences.
The first author was botanist Juan Ochando.
What made the discovery important was the proposed
purpose of the pit.
Researchers believe Neanderthals may have used the
sticky resin of the rockrose plant to produce an adhesive. The plant, abundant
in the Mediterranean region, contains a substance known as labdanum.
The proposed process involved placing plant material
inside a pit, covering it with sand and earth, and heating it from above.
By limiting the amount of oxygen reaching the buried
material, the process could heat the plant matter without allowing it to burn
completely.
The resulting substance could then be collected as
tar.
Why would Neanderthals need it?
One important use of prehistoric tar was hafting: attaching
a stone point to a wooden shaft to produce a more effective spear or other
tool.
A stone flake by itself could be sharp, but attaching
it securely to a handle created a more versatile hunting weapon.
The researchers did not rely exclusively on chemical
analysis. They also attempted to reproduce the proposed production method
experimentally, using a sealed pit and a controlled fire.
Their experiments produced enough adhesive material
to attach stone points to two spears.
The result supported the possibility that the ancient
pit had been used for deliberate tar production.
However, an important scientific question remains.
Researchers would like to find more direct evidence linking rockrose-based tar
to stone tools recovered from the site.
That would strengthen the connection between the
proposed production method and the actual tools used by Neanderthals.
Even with that qualification, the discovery raises an
important point.
Producing adhesive through a controlled heating
process requires more than accidentally burning plants.
Someone must identify suitable material, understand
how it behaves under heat, limit oxygen, and manage the process carefully
enough to obtain a useful substance.
Such knowledge may have been developed through
experimentation and passed between generations.
It provides another reason to reconsider assumptions
about Neanderthal
technology and prehistoric innovation.
Why Gibraltar's Neanderthals Used
a Different Plant to Make Tar
The choice of plant is another interesting part of
the discovery.
At other prehistoric sites in Europe, researchers
have identified Neanderthal tar associated with birch bark.
But birch was not as readily available in the
Mediterranean environment around Gibraltar.
The local population appears to have had access to
rockrose, making it a potentially practical alternative.
This is an important detail because it demonstrates
how prehistoric technology could adapt to local environmental conditions.
Rather than relying on a single material or method,
Neanderthals may have developed solutions based on the plants and resources
available in their surroundings.
Labdanum, the resin associated with rockrose, has a
much longer history of human use. It has been valued for its fragrance and has
appeared in traditional preparations and perfumery.
The possibility that Neanderthals were extracting and
processing it tens of thousands of years ago adds another dimension to the
history of ancient
adhesives and early chemical technology.
The researchers also suggested that a rapid movement
of sand helped preserve the pit.
That natural covering protected pollen and other
microscopic traces, giving scientists an opportunity to reconstruct aspects of
the environment in which the process took place.
It is another example of how geology can preserve
evidence of activities that would otherwise disappear without a trace.
The Lost Mediterranean Landscape
Beneath the Modern Sea
To understand why Gibraltar was so important to
Neanderthals, it helps to imagine the landscape as it existed during the Ice
Age.
The coastline was not where it is today.
During colder periods, enormous quantities of water
were locked inside ice sheets and glaciers. Global sea levels were consequently
much lower.
Around the Gibraltar region, the sea may have stood
as much as 85 metres below modern levels during some of these periods.
That meant the shoreline lay considerably farther
away from the cave entrances.
Researchers have reconstructed an extensive coastal
plain that included sand dunes, woodland, scrubland, and seasonal lakes.
The exposed landscape provided access to a wide range
of resources, including animals, plants, and marine food sources.
Some descriptions have compared the richness of this
ancient environment to a Mediterranean version of an African savanna.
The Neanderthals living in the region could exploit
several different habitats rather than depending on one source of food.
Evidence published in 2008 by a research team
including Chris Stringer and Clive Finlayson helped demonstrate the diversity
of their diet.
The researchers examined animal remains from Gorham’s
and Vanguard caves.
They identified evidence of marine resources,
including monk seals and bottlenose dolphins, alongside mussels and other
coastal foods.
Some mussel shells showed signs of heating,
suggesting that they had been exposed to fire. Other marine remains displayed
cut marks consistent with processing using stone tools.
The animal remains also included ibex, red deer, wild
boar, rabbits, and tortoises.
This evidence points towards a varied prehistoric diet,
combining terrestrial hunting with the exploitation of coastal resources.
It also suggests that Neanderthals were capable of
understanding and using different parts of their environment.
The coastal landscape did not remain unchanged.
As the climate warmed and ice sheets melted, sea
levels rose. The exposed plain gradually disappeared beneath the water.
The territory that once supported animals and
prehistoric communities is now largely submerged beneath the waters around
Gibraltar and the Strait.
For archaeologists, this creates an unusual
challenge: some of the most important parts of the ancient landscape are no
longer accessible as dry land.
The Engraving That Challenged the
Idea That Only Modern Humans Created Art
Food and technology are important, but one of the
most controversial discoveries in Gorham’s Cave concerns something less
practical.
In July 2012, researchers working deep inside the
cave uncovered a pattern carved into the bedrock.
The markings consisted of several deep lines arranged
in a cross-hatched design, with additional shallower lines crossing them.
The engraved area measured approximately 15 by 20
centimetres, making it roughly the size of a small notebook.
It was not immediately obvious what the pattern
represented.
The team published its findings in 2014 in the
journal Proceedings of
the National Academy of Sciences, with JoaquÃn RodrÃguez-Vidal as
lead author.
The researchers investigated how the lines could have
been produced.
They attempted to reproduce the markings using stone
tools on similar dolomite rock. Their experiments indicated that creating
grooves of comparable depth required repeated, deliberate movements.
The team argued that the pattern was not simply an
accidental scratch left behind during ordinary activities such as cutting meat
or preparing animal hides.
Instead, they interpreted it as a deliberately
created abstract design.
The dating was also important.
Sediment covering the engraving contained Mousterian
stone tools associated with Neanderthals. The researchers concluded that the
markings were at least approximately 39,000 years old.
If the interpretation and dating are correct, the
engraving provides significant evidence that Neanderthals were capable of
producing deliberate abstract designs.
However, the discovery has also attracted scientific
debate.
Some researchers have urged caution about the precise
dating and the certainty of attributing the marks to Neanderthals.
That caution is important because archaeological
interpretations must be tested against alternative explanations.
Nevertheless, the Gibraltar engraving remains a major
part of discussions about Neanderthal
symbolic behaviour and the origins of art.
It challenges the assumption that abstract expression
was an ability exclusive to modern humans.
The Feathers That May Reveal a
Different Kind of Neanderthal Culture
Another discovery from Gibraltar concerns bird
remains.
In 2012, researchers published an investigation
examining bird bones from several cave sites.
Their wider analysis included archaeological records
from almost 1,700 locations across Europe and Asia. They also examined hundreds
of bird bones recovered from Gibraltar.
The researchers found that wing bones were
particularly common.
Many of the bones showing cut marks from stone tools
were also wing bones.
That detail mattered because bird wings contain
relatively little meat compared with other parts of the body.
However, they contain valuable flight feathers.
The remains included birds of prey, such as vultures
and eagles, as well as crows and related species.
Dark-feathered birds appeared more frequently than
expected in the studied material.
The researchers proposed that Neanderthals may have
removed feathers for purposes other than eating.
One possible explanation is that feathers were used
as decoration or for other forms of symbolic expression.
If correct, this would suggest that Neanderthals were
not simply collecting food and making tools. They may also have used natural
materials to communicate identity, status, or personal expression.
The evidence does not prove exactly how the feathers
were used.
But it adds to a growing body of archaeological
research suggesting that Neanderthal
culture was more complex than earlier generations of scientists
believed.
Did Neanderthals Survive in
Gibraltar Longer Than Anywhere Else?
One of the biggest unanswered questions surrounding
the Gorham’s Cave Complex concerns the timing of Neanderthal extinction.
The conventional scientific picture places the
disappearance of Neanderthals from most of Europe around 40,000 years ago,
although the exact timing varied between regions.
Gibraltar has become central to the debate because of
radiocarbon dating from Gorham’s Cave.
In 2006, Finlayson and colleagues published research
in Nature
examining dates from archaeological layers inside the cave.
Some of their results suggested that Neanderthal
occupation may have continued much later than previously expected, potentially
reaching approximately 28,000 years ago, with some interpretations suggesting
even later survival.
That conclusion remains controversial.
Other researchers have argued that the evidence does
not securely establish such a late Neanderthal presence and that the final
occupation may have ended considerably earlier.
The disagreement illustrates one of the major
difficulties in archaeological
dating.
A date obtained from a sediment layer does not
automatically prove that every object or activity associated with it belongs to
precisely the same period. Contamination, the movement of material, and the
limitations of dating techniques can all affect interpretations.
For now, Gibraltar remains one of the most important
locations in the debate over the final survival of Neanderthals in Europe.
If the later dates are supported by additional
evidence, they could significantly change the timeline of human evolution.
But even without accepting the most controversial dates,
the cave complex demonstrates that Neanderthals occupied this region repeatedly
over an extraordinary span of time.
What the Newly Opened Chamber
Could Reveal Next
The excavation of the sealed chamber is not the end
of the investigation.
It may be the beginning of a much larger
archaeological project.
Researchers believe substantial deposits remain
beneath the exposed chamber. Those sediments could preserve evidence of
additional animal remains, tools, plant material, and traces of prehistoric
occupation.
One particularly exciting possibility is the recovery
of ancient
environmental DNA, often called sedimentary DNA.
Scientists can sometimes identify traces of organisms
from DNA preserved in soil and sediment, even when visible bones are absent.
If suitable material survives in the deeper deposits,
researchers could potentially identify animals and other organisms that once
occupied the cave.
Such evidence might help reconstruct the ancient
ecosystem in greater detail.
There is also interest in discovering additional
signs of human activity, including possible burials or footprints.
However, these remain research possibilities rather
than confirmed discoveries.
The team expects that excavating the deeper deposits
could take many years, perhaps decades, because the sediment must be removed
and studied carefully.
Every layer has the potential to reveal a different
chapter of the cave's history.
The Discovery That Forces Us to
Rethink Neanderthal Intelligence
Return to the small sea snail found inside the newly
opened chamber.
It is easy to overlook compared with the dramatic
discovery of a hidden room or the recovery of ancient animal bones.
Yet that shell may tell us something important.
Someone collected it from the coast, carried it into
a sheltered space, and left it behind before the chamber was sealed.
Elsewhere in the same complex, researchers have
uncovered evidence of marine food gathering, possible feather use, deliberate
engravings, and a sophisticated method of producing adhesive.
None of these discoveries alone answers every
question about Neanderthal intelligence.
Some interpretations remain debated, and future
research may change what scientists currently believe.
But together, they provide a much richer picture of a
human relative who could adapt to changing environments, exploit diverse
resources, manufacture tools, and possibly express ideas through abstract
designs.
For much of modern history, Neanderthals were
portrayed as primitive failures who disappeared because they lacked the
abilities of Homo
sapiens.
The archaeological evidence from Gibraltar makes that
simple explanation increasingly difficult to defend.
The most important lesson from the sealed chamber may
not be what archaeologists found inside it.
It may be what the discovery reveals about how much
of Neanderthal history remains hidden beneath the ground.
A passage sealed by sand for at least 40,000 years
has finally been opened. Beneath it may lie an even larger archive of
prehistoric life.
And as researchers continue digging, the story of the Neanderthals could become considerably more complicated than anyone once imagined.
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