A releasable tool using an electronic motor to drive a collet and associated collet arms to engage or release a quick change sub that may be coupled to additional downhole tools, such as a perforating gun string.

A method for providing a subsea template system with a tail pipe, and a subsea template system are disclosed. The subsea template system comprising a structure including a guide with an opening, and including a plurality of supports for engaging a seabed; a tail pipe being cylindrical and comprising a serrated end structure at a first (lower) end of the tail pipe, the tail pipe arranged at the opening, and the tail pipe comprising an interface for rotating and axially move the tail pipe relative to the structure. The method comprising: placing the structure and the tail pipe on the seabed; rotating and moving axially the tail pipe relative to the guide and into the seabed; drilling with the drill string an opening for an outer conductor casing; and installing the outer conductor casing and applying cement between the outer conductor casing and the tail pipe.