At 11.46 hours on 25 Sep 1943, USS Skill (AM 115) (LtCdr E.J. Kevern, USNR) was hit by one of three torpedoes from U-593 while on patrol station between Point Licosa and Isle of Capri in the Gulf of Salerno. The torpedo caused a explosion in the forward magazine, breaking the ship in two. The forepart capsized and the aft part caught fire, later exploded and sank at about 12.00 hours. Ten minutes later, the capsized bow also went down.

USS Seer (AM 112) screened USS Speed (AM 116) while she rescued 32 men (all wounded, one of them died two days later), but no officer survived. An unsuccessful search for more survivors was conducted by USS Pilot (AM 104).