I agree, but if the robot submarines prove themselves in a combat situation, the Two class will be phased out.

The city plans to find the leaks with a robot submarine that will be sent into the aqueduct and return with pictures of the cracks.

Some robot demonstrations that give the best superficial impressions - like the "robot" submarine that explored the Titanic in 1985 -have no autonomy at all.

Scientists, meanwhile, use it to monitor live video and data signals from robot submarines on the ocean floor.

Full details and video pictures taken by the robot submarine will be made public at a Washington press conference on June 22.

John Davies, a member of the team that found the ship, said the warship was found 15,000 feet deep in the Atlantic with the camera-equipped robot submarine.

It is negotiating with the Woods Hole Oceanographic Institute to build a small robot submarine that will be used to survey the aqueduct.

Also today, large parts of the tail were spotted by a robot submarine, and searchers found the aircraft's log book, which includes maintenance records, floating on the water.

In 2008, a clean-up project using Geiger counter-fitted robot submarines will search out and retrieve each particle individually, a process that will take years.