Drilling ships with dynamic positioning systems were employed together with marine Piggyback or CCS drilling equipment in nearly all cruises. Heatflow measurements were also done from these ships.
Various fishing, supply and survey vessels were used in the early-mid 1980s to obtain short bedrock cores using a small deployable electric drill and overburden material using a vibro-corer.
Maximum penetration is 5.5 m with possible extension to 8.5 m. Core diameter is 25 mm.
The BIO-Drill can be operated from any vessel that has a winch system capable of handling the equipment at the given water depth.
Marine piggyback diamond coring
An outer drill string (modified API 5" = 127 mm outer diameter, 4" = 101.6 mm inner diameter), guided through a 15 t heavy seabed re-entry frame (seabed template), is used to drill through the (poorly consolidated) overburden, using e.g. a roller bit. When the bit has reached the top of the (hard) bedrock, the string is fixed by hydraulic clamps in the seabed template. As the drillstring is heave-compensated, its top has now a fixed height above seabed, while the ship still can move up and down.
Complete Coring System (CCS)