Intelligent Whale submerged by filling water compartments, and expelled the water by pumps and compressed air. It was estimated that it could stay submerged for about ten hours. Thirteen crewmen could be accommodated, but only six were needed to make her operational. The only known trial, reported by submarine pioneer John Philip Holland, was made by a certain General Sweeney and two others. They submerged the boat in 16 feet of water and Sweeney, clad in a diver's suit, emerged through a hole in the bottom, placed a charge under a scow, and re-entered the submarine. The charge was exploded by a lanyard and a friction primer attached to the charge, sinking the scow.
As of June 2007, this submarine is on exhibit at the National Guard Militia Museum of New Jersey in Sea Girt, New Jersey