AM36 any year
In 1939 anywhere will do, so long as it's not west of the British isles
St. George's Channel and the approaches to Bristol in 1940 and early 41
for 1942 I prefer the Med
1943, oh, way out in the Atlantic or possibly the Caribbean
1944 and 1945 a comfortable sub-pen with a thick roof, yes indeed
but if I must go out there, AM36