U-515 engaged the machine with her 3.7 - cm anti-aircraft gun .
On 8 April 1944 , U-515 spotted a carrier - based aircraft and submerged ; an hour later she surfaced and was attacked by another aircraft .
U-515 engaged the machine with U-515 's 3.7 - cm anti-aircraft gun .
On 8 April 1944 , U-515 spotted a carrier - based aircraft and submerged ; an hour later she surfaced and was attacked by another aircraft .