Hi,
You have to hit one of the horns on a buoyant mine, although they can be magnetic.
In shallow waters the ground mine is the one to avoid, magnetic or acoustic, or, later on, pressure. You really should not have to worry about these since they are not laid over 20 fathoms and a prudent skipper would not be in shallow water, buoyant however, could be laid down as deep as 100 fathoms, with the mines set to about periscope depth. They were barriers to discourage skippers from going into areas frequently used by surface ships. Incidentally, buoyant mines could have a thin line attached to a horn at one end and a small float on the other, which would drift on the surface, almost invisible, to snag the unwary passer by.
RR
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