A system (20) for drilling a deep-sea borehole (20) in a seabed (30) is provided. The system includes a drill string (40) having a plurality of strands adapted to be reversibly connected together to assemble the drill string and reversibly disconnected from one another to disassemble the drill string. The system further includes a submerged drilling deck (50) anchored on the seabed, the deck adapted to reversibly connect the strands (40a, 40b) together and to reversibly disconnect the strands from one another. Methods of disassembling and assembling the drill string are also rovided.
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