Please provide a link to Collins with this translation.
A "Turm" is a tower. The conning (steering/commanding) tower is the part of the U-Boot, where the commanding officer directs the U-Boot.
In German it's simply called "Turm" - without any further concretization.
A ship has a conning bridge, in German the official term is "Kommandobruecke" - command bridge - but more than often only referred to as "Bruecke".
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