3. A SEA FLOOR SEDIMENT SAMPLER COMPRISNG A HALF CYLINDER TOP IN COMBINATION WITH A HALF CYLINDER BOTTOM ROTATIVELY SUPPORTED AXIALLY BY AND SNUGGLY WITHIN SAID TOP WHEN ARMED FOR SAMPLING, POWER MEANS FOR ROTATING SAID BOTTOM TO CUT OUT A SEDIMENT SAMPLE FROM THE SEA FLOOR, SAID ROTATION BEING IN RELATION TO SAID TOP SO THAT SAID TOP AND BOTTOM WILL CLOSE TO FORM A CYLINDRICAL ENCLOSURE FOR ENCASING SAID SAMPLE SAID ROTATIVE SUPPORT FOR SAID BOTTOM BEING PROVIDED EXTERNALLY OF THE BOTTOM WHEREBY SAID ENCLOSURE REMAINS OPEN-CENTERED FOR ENCASING SAID SAMPLE IN A RELATIVELY UNDISTURBED CONDITION.