Bg Corporation

Christopher Heywood

Andrew Patrick Hollis

David Bone

Apparatus for providing an offshore drilling operation in a sea, the apparatus comprising a drilling derrick support structure (,) having a base (,) to rest on the sea-floor (,) and a deck (,) to support a drilling derrick (,), the structure being in the form of a concrete block (,) having a hollow cavity to enable the block (,) to be floated to the site where drilling is to take place and being adapted to receive ballast into the cavity in such a way and in a sufficient quantity as to cause the block (,) to sink base-first and rest upon the sea-bed with the deck (,) clear of the surface of the sea, a drilling derrick (,) for mounting on the deck (,) of the block (,) and a tender assist barge (,) for transport to the site in down to 2 m of water to provide services, supplies and equipment to the drilling derrick (,).

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Dartmouth, United Kingdom

Christopher Heywood