Remote operation wire line core sampling device

A remote operation wire line core sampling device comprising:

• a water swivel assembly;
• a drill rod coaxially connected to said water swivel assembly;
• a wire line core barrel coaxially connected to a lower end of said drill rod and having at a forward end a bit for annularly digging ground;
• an inner tube assembly detachably set in said wire line core barrel;
• and
• an over-shot assembly for grasping an upper end portion of said inner tube assembly,
• wherein said water swivel assembly includes an upper water input port at an upper position of said water swivel assembly, said upper water input port adapted to allow pressurized fluid into said water swivel assembly, and a lower water input port at a lower position of said water swivel assembly, said lower water input port adapted to allow pressurized fluid into said water swivel assembly, and
• wherein said water swivel assembly accommodates the whole of said over-shot assembly at an intermediate position thereof between said upper water input port and said lower water input port such that the pressurized fluid is supplied from said upper water input port to lower said over-shot assembly through said drill rod to an upper end of said inner tube assembly.