Underwater drilling apparatus and method for creating a cased borehole underwater

Abstract

The invention relates to an underwater drilling apparatus comprising a lowerable platform configured for setting down on a waterbody bottom, at least one support tube axially displaceable and rotatably mounted on the platform, at least one tubular drive arranged on the platform and configured for rotationally driving the support tube, in order to rotationally introduce the support tube into the waterbody bottom, and an in-hole drilling rig arranged in the support tube, wherein the in-hole drilling rig comprises: a rig base body, at least one clamping device for bracing and securing the in-hole drilling rig in the support tube, and a drill head which is axially displaceably and is rotatably mounted on the rig base body and can be rotationally driven by means of a drill drive. According to the invention, it is provided that, when the support tube is rotationally driven, the in-hole drilling rig is arranged in the support tube and is axially clamped thereto.

Dependencies are inferred from the claim text.