Cable connection method, mobile object, and connecting object

A cable connection method comprising:

• removing, from an offshore wind power facility, electrical conductors of a first cable and a second cable that are serially connected to the offshore wind power facility and that transmit electric power;
• providing a first protective member including a waterproof member configured to make a conductor end portion of the removed first cable waterproof, the first protective member being configured to protect the conductor end portion of the removed first cable;
• assembling a mobile object by fixing the first protective member to a retention unit configured to retain the first cable in the offshore wind power facility;
• and
• providing a second protective member including a waterproof member configured to make a conductor end portion of the removed second cable waterproof, the second protective member being configured to protect the conductor end portion of the removed second cable;
• assembling a mobile object by fixing the second protective member to a retention unit configured to retain the second cable in the offshore wind power facility;
• suspending the mobile objects from the offshore wind power facility using wire ropes and holding the mobile objects in the sea;
• lifting the mobile objects held in the sea onto a workboat;
• dismantling the mobile objects lifted onto the workboat;
• connecting the conductor end portion of the first cable and the conductor end portion of the second cable that have been housed in the mobile objects;
• assembling a connecting object including a closed protective object configured to house the connected conductor end portions;
• fixing, using coupling tools, the protective object and the retention unit of the first cable and fixing, using the coupling tools, the protective object and the retention unit of the second cable;
• and
• lowering the connecting object to bottom of sea.