Since 1993 the bivalve "Teredo navalis" has re-invaded the Baltic Sea from Copenhagen to Rügen. Damages to wooden installations, ships and underwater heritage sites are running up to hundreds of millions of Euros, and no end is in sight. The warm summers lately even increased shipworm propagation. The wood-eating gribble Limnoria lignorum has also been sighted in growing numbers in the Western Baltic.
A "remotely operated vehicle" is a small tethered submarine, that substitutes or complements laborious research diver operations. It can provide optical inspections (video and photographic documentation) of benthic communities, piers, shipwrecks, etc.. Sensor data coverage, water and sediment sampling is also feasible.
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