Hello Jan-Olof and Brian,

So M 154 is a typo in the SPICHERN report. Many thanks.

Circular runs did not occur often with British submarines. In my database I have noted one (HMS UPHOLDER at 1107/9 November 1941 while attacking the heavy cruisers TRENTO and TRIESTE) but from memory I think there are at least one or two more instances. Perhaps Brian can come up with them? A couple of submarines (P.32 and PERSEUS) were lost while about to fire torpedoes so I am not sure if a premature torpedo was not the cause rather than a mine.

Best regards,

Platon