its either planes or a spy onboard or some bug somewhere, mines or anti-subnets (haven't encountered nets appart from SH3 yet so far tho) are attached to the bottom and since the bottom is over 1000 depth, thats quite unlikely.
planes still doubtfull tho, sice 40 seconds before i dived from periscope depth to 30m depth, i was with periscope and thus also Radar active, and nothing was seen on radar by any of my officers (i still play on "easy"-custom settings, need to get back into the game before the real deal :-) )
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