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The first of a total of 91 type VII C/41 submarines
went into service in the summer of 1943. At that time
the operating conditions for the submarine crews had
totally changed. The tactic of "hunting in packs" used
in 1941-42 only rarely led to the successful tracking
of convoys and the sinking of individual ships. Modern
escort protection forces were successful in shielded
the ships and special sub-chaser fighter planes widely
patrolled the sea areas where there were submarines.
In order to be better able to defend themselves on
the surface against surprise attacks from the air, the
VII C/41s received an enlarged fin superstructure
known as the "large glasshouse". The so-called fin IV
had aft on its upper platform two 20 mm twin anti-
aircraft guns and on a lower platform one 37 mm
M42U anti-aircraft cannon. Another feature of these
submarines was a snorkel mast that could be brought
up from the deck when surfaced to take in fresh air
and let out the waste air. Thus the accumulators
could also be operated at higher speed under water
and with a full load in daytime. There were 5-man life
rafts stored in four water-tight containers on the
fore-deck. Thanks to the improvements to structural
steel, submarine VII C/41 could dive down to 250 m.
With losses of 44 submarines, by the end of the
Battle of the Atlantic, type VII C/41 submarines had
damaged or sunk 38 Allied ships with a total GRT of
138,622. 1444 members of VII C/41 crews were killed
in battle or in accidents.
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