A wide range of different types of geologie are common at the deep sea. Nannofossil oozes and mud, gas hydrate bearing sediments, carbonates, massive sulfide ore deposits, volcanic rocks as well as metamorphic rocks can be found. Most of these geologies already were drilled with the MARUM-MeBo70.
Expedition CE0619, off Ireland: , Orthogneiss (upper left), paragneiss (lower left) and conglomerates were drilled offshore Ireland for for the Irish Shelf Petrol Studies Group (ISPSG) of the Irish Petroleum Infrastructure Programme Group 4. The big advantage of sea bed drill rigs compared to drill ships are, that they drill from a stable platform at the sea bed. The drilling process isn't affected by waves or currents which allows optimal control on weight on bit.