These have the appearance of underwater mines with timers on them.

At the time of the attack, the Stark was moving very slowly, looking for underwater mines.

In that time, they have rid the soil of 16 million artillery shells, 490,000 bombs and 600,000 underwater mines.

My guys say those tubes are definitely underwater nuclear mines.

Sure enough, it involved initial testing of nuclear-tipped underwater mines.

Catfish quickly checked his map and saw that the F-16 had been hit a quarter mile from the location of the very last underwater mine.

Depth Charges are weapons used against submarines and underwater mines.

At 1316, she struck two Mk-36 underwater mines close aboard her port side.

Each underwater mine was attached to an electric cable that ran up the cliff to the firing post.

Instead, it escaped but was ultimately destroyed by an underwater mine at a later time near Poole.