Interesting war diary

[Tycho]

Quotes from the last translated KTB on U-boat Archive site.

U-83's 9th patrol, The boat Operated in the Mediterranean off the coast of Egypt:

15.08.42
Can not remain at periscope depth because of the heat. Only bearable at 80 meters.

16.08.42
Dived.
Went at least every hour to periscope depth. The temperatures are indescribable.
Water = 30°, control room = 34°, living room = 38°, diesel engine room = 56°.

I think to simulate it.
Close all door and windows in the room. Plug some heating. Wait until the temperature rise, then start to play SH3, new Mediterranean patrol.