Installations under water

November 2015. The three-stage sampler from NIVA is a big water pump which uses massive amounts of energy (raft scale). It floats on the side of the raft while it pumps exactly 15.000 litres of water through three filters of varying sizes.

We preserve these filters so that onshore researchers later can detect plastics. The sampler was launched today, as was Jostein, our under-water photographer. In these pictures you can see the sampler with the floater box on top. The floater box is carefully calibrated to keep the sampler floating in water. The blue rope is an electrical cable which transmits power as well as control signals; power is cut off after extactly 15.000 litres.

In the last picture, you can see the raft from underneath, including the Kongsberg EK80 echo sounders, guara boards, and a fish!