See Figure 11 showing a Battleship surrounded by a ISP Net.

The possibility of a torpedo exploding in a net surrounding a ship always existed. If the net was placed too close to the ship it might fail even if it stopped the torpedo. Therefore, the ISP installation was designed to be installed at a distance of 60 feet from the ship. The net was either 30 or 40 feet deep depending upon the draft of the ship to be protected. The net was suspended from floats held out from the ship by steel spars as shown in Figure 11.

These nets could also stop torpedoes fired from a torpedo airplane. Before these torpedoes would detonate they had to arm themselves by moving a certain minimum distance through the water. At that time the arming distance was at least 150 yards. If a efficient torpedo net was maintained well within that space and around the ship it was relatively secure against torpedo attack.

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USS Baretta AN-41 and USS Cliffrose AN-42 sailed from Pearl Harbor 8 August 1944. Their orders read that they were to go to the Florida Islands for the upcoming invasion of Peleliu, which was one of the islands in the Palau group of the Western Caroline Islands.

They each carried on board 2 fleet mooring buoys and 12 Individual Ship Protective 2 Panel torpedo nets, together with spars and fittings. It was planned that the two ships would lay the moorings on arrival at Peleliu, and install the Individual Ship Protective nets during early assault operations. Information indicates that they also laid anti-torpedo nets across the western entrance of Kosoll Passaqe in the Palaus.