A new coring tool, capable of penetrating ocean sediments to a depth of at least 5 to 7 meters and termed a 'bootstrap' corer, features: (1) light weight (approx. 140 kg for a tube 7 m long), (2) simplicity, (3) large internal diameter (approx. 13 cm), (4) powerful 'vacuum' operation, (5) deep penetration, (6) a novel piston and pullout relief mechanism that minimizes pullout forces, and (7) a not abnormal distortion of the sediment sample.

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