Buildings
Judging from acoustic images produced by state of the art Side Scan Sonar equipment, what appear to be steps in the underwater ruins (described as looking like square and rectangular tanks) suggest the area may have contained a bath, which is the central feature of other ancient Harappan towns. There also appear to be an acropolis and a buried residential settlement.

Skepticism
The images NIOT collected do not mean there was an ancient civilization. The existence of such a civilization would perhaps too conveniently buttress other theories about ancient geography. NIOT is not comprised of a group of archaeologists, so there is even question about the validilty of its claim to have come upon a great archaeological find.

Online Resources

The Hindu
Story gives names of important people involved in the Gulf of Cambay exploration and looks at the next steps that will be taken in studying the NIOT findings.

"The Lost World," from May 27, 2001's "The Indian Express"
This story about the discovery likens it to that most famous legendary sunken civilization, Atlantis.

Indian Seabed Hides Ancient Remains
The basic story with pictures and references, from the BBC.

Lothal
Harappa.com looks at old Harappan cities, including Lothal, on the Gulf of Cambay. Serious floods, which threatened to destroy Lothal, prompted the citizens to elevate their buildings.