the U boats..
Submarines were sometimes referred to as submersibles.
U-Boat , ULTRA ,U-boat, the name for German submarines during World War 2
submarines
the word in German is Unterseeboot -- literally, boat under the sea. The informal name for the vessels are U-Boat.
The Yanks
Convoy
The name U-boat was applied to German submarines.
'U-boats' was the name given to German submarines in both the first and second world war.
Of the 52 US Navy Submarines lost during WW2, fifty were lost in the Pacific and only two were lost in the Atlantic Oceans (both by accidents). The two Atlantic US Submarines lost were the USS Dorado and USS R-12. The Submarine DORADO was sunk by friendly fire (US Aircraft) and the Submarine R-12 was sunk during a diving accident.
A German submarine used in WW I was called a U-boat.
Non-aligned nations Buffer States
There were no surface ships in a U-boat wolf pack. (The submarines, like American subs, were called, "Boats".) The smallest wolf packs were 2 to 4 submarines, while the largest wolf packs could contain up to 20 submarines. The size of the wolf packs always depended on what their commander, Karl Doenitz wanted them to do.