 Two boats of the 10th Submarine Flotilla had been sunk, two were damaged in harbour and on 26 April the flotilla was ordered out because of mining by small fast craft, which were undetectable by radar and inaudible during the bombing; the surviving minesweepers were too reduced in numbers to clear the approaches.Three reconnaissance aircraft remained and only sorties were flown, eleven more by FAA aircraft during the month and by the start of June, only two Fairey Albacores and two Fairey Swordfish were left.From December 1941, "Luftwaffe" bombing neutralised Malta, decrypts of Italian cipher messages showed more sailings and fewer losses and on 23 February 1942, an Italian "battleship convoy" reached Tripoli.