Marine archaeologists in India believe they have found a sunken
'lost city' which pre-dates all previous signs of
civilisation by 5,000 years. The site lies at a depth of 36m, 40
miles off the coast of Gujarat, in an area known for dangerous
currents and rip tides. Most of the investigative work has been
carried out using sonar scanning equipment which reveals the buried
structure. Divers have retrieved a number of artefacts which have
been carbon dated to 7,500BC. If these dates are correct, the city
will predate the earliest known urban civilisation by 2,000 years.
The discovery has been greeted with scepticism by many experts as
carbon-dating is not regarded as completely reliable.

Source: www.divernet.com