Divers are still excavating at the site at the bottom of the Solent
In the process, silt formed on top and preserved both tools, such as flint knives and scrapers, as well as charcoal, worked pieces of wood, nuts and other organic material, which would have disappeared on land.
"It's called the Stone Age because, on land, we find stones from this period but under water a whole lot more survives," Mr Momber said.
"I believe these people were far more sophisticated than we give them credit for."
Among the discoveries are wooden poles and structures believed to have been used to build houses and canoes.
"The reason so little is known about the lives of the Mesolithic people, is because most of the sites where they settled are now on the seabed," Mr Momber added.
A wooded pole with a flint knife embedded in it was found in 2004
"The whole of the North Sea could be covered in sites like this one.
"If we want to understand the Mesolithic people - how they went from hunter-gatherers to farming - we need to look under the water."
In 2004, the team carried out another excavation on a less intact site 300yds (275m) away.
This showed signs of having been by a river and Mr Momber believes the two sites were linked.
He said it was likely the larger one was where the people lived and the other where they went to catch fish.
Tamzin Scott goes through layers of mud from the seabed
However, there is still a lot more work to be done until it is known what Bouldnor Cliff looked like and how the site was used.
To put it in perspective, Mr Momber compared the find to one of the more "modern" historic finds in the Solent.
"The Mary Rose is only about 500 years old - this was well before that, well before the pyramids, which are 3,000 years old and way before Stonehenge was built, which was only 5,000 years ago," he said.
Mr Momber added they hoped to secure more funding so they could continue their work before the artefacts were lost forever, as the Bouldnor Cliff area was being washed away fast.
http://news.bbc.co.uk/1/hi/england/hampshire/6928293.stm