in Wolf Pack by Gordon Williamson on page 78 there are descriptions of German mines and their opperating depths - The SM(Schachtmine)A is quoted as "...it could be used in waters up to 250meters depth".
also in Subs and Submariners by Arch Whitehouse, a reference is made that, "...German moored mines could be laid at any depth up to six hundered feet and more".
(Six hundered feet being aprox 180m)
haven't read the below link but....?
http://en.wikipedia.org/wiki/Naval_mine
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