Model of a piston corer, a tool used since the 1950s on research vessels to take sediment cores from the ocean floor. This model was build and is located at the Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany.
<a href="//commons.wikimedia.org/wiki/User:Hgrobe" title="User:Hgrobe">Hannes Grobe</a>, AWI
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>