How do you splice electric wire for underwater use?

To splice electric wire for underwater use, first, ensure the wires are clean and free of insulation by stripping about an inch of the wire ends. Twist the exposed wire strands together securely and use a waterproof connector, such as a heat-shrink butt connector, to cover the splice. Apply heat to the connector to create a watertight seal, and then use electrical tape for additional protection. Finally, encase the splice in a waterproof enclosure or conduit for added durability against water exposure.