At some point in its history, it was struck amidships, and repaired. Any way, it, along with two other O-class boats, was supposed to do a "deep" test dive off of Portsmouth, NH. It was last in line to go, and it didn't come back up.
I had an old neighbor that was in the Coast Guard back then, and he claimed to have been involved in the search a sub. I said the "Squalus", and he said, "no, another one".
So I guess he just wasn't telling a tale.
Then he tells me that the Squalus sank because the captain didn't give enough notice before diving the boat.
He claimed to have talked with one of the sailors from the Squalus and what really happened was that the cook opened a hatch to go out and dump the garbage. "They never found his body..."
The O-9 was lost in 450 feet of water about fifteen miles off Portsmouth, New Hampshire (her crush depth was only 200 feet) with a crew of thirty-three officers and men. Her wreckage was located on September 20, 1997 and the team that located her reports that her hull is crushed from the conning tower all the way back to the stern.
The R-12 was a training submarine that the US was planning on donating to the Brazilian Navy. On June 12, 1943, the R-12 was conducting torpedo attack drills off Key West, Florida when her forward battery compartment began flooding. The crew attempted to blow ballast tanks to bring her to the surface, but their efforts were overcome by the flooding seawater, and she went down with forty Americans and two Brazilians.
The S-28 started the war as a combat submarine, serving mainly in the Aleutians where she sank the freighter Katsura Maru #2, before becoming a training submarine off Hawaii. On July 4, 1944, the S-28 was conducting anti-submarine training with the Coast Guard cutter Reliance when all contact was lost. An extensive search-and-rescue mission was launched, but the only thing they located was a large oil slick that came to the surface near S-28's last position a few days later. Fifty officers and crew went down with the S-28.
In addition, two submarines, the Tullibee and Tang were lost due to defects in their own torpedoes that caused the weapons to circle around and hit the subs. Tullibee went down with 79 of 80 men, while Tang was lost with 78 of 83 men.