Detachable mooring chain link, connection system and method for disconnecting two mooring chains underwater

A detachable chain link for use in connecting and disconnecting upper and lower mooring chains, the detachable chain link comprising:

• an imaginary transverse plane passing through a geometric center of the detachable chain link, dividing the detachable chain link into an upper part for connecting to the upper mooring chain and a lower part for connecting to the lower mooring chain;
• and
• a link body having an upper arched segment for connecting to a link of the upper mooring chain, a lower arched segment for connecting to a link of the lower mooring chain, and a straight segment extending between the upper and lower arched segments, the link body including a closing piece that is movable into and out of an opening located between the upper and lower arched segments, the opening being located opposite the straight segment, the closing piece being configured to close the opening when moved into the opening, the link body including a connection point arranged in the upper part of the detachable chain link above the imaginary transverse plane, the connection point being configured to receive a lifting force, and in response to receiving the lifting force, causing a rotation of the link body.