2. IN A DEVICE FOR MOORING A NORMALLY BUOYANT DETONATOR AT A SELECTED DEPTH IN THE SEA AFTER THE DETONATOR IS PLACED IN THE SEA, IN COMBINATION, A CABLE PAYOUT REEL ROTATABLY MOUNTED ON THE DETONATOR, A CABLE ONE END SECURED TO THE PAYOUT REEL AND WOUND ON THE PAYOUT REEL, AN ANCHOR SECURED TO THE OUTER END OF THE CABLE, AND MEANS RESPONSIVE TO THE HYDROSTATIC PRESSURE OF THE SEA AT A GIVEN DEPTH FOR CONTROLLING THE ROTATION OF THE PAYOUT REEL SO AS TO MAINTAIN THE DETONATOR AT A GIVEN DEPTH IN THE SEA WHILE THE ANCHOR SINKS TO THE SEA BOTTOM, A FLUKE ANCHOR, A RELATIVELY SHORT FLEXIBLE CONNECTION BETWEEN THE FLUKE ANCHOR AND THE FIRST MENTIONED ANCHOR.