Various shipboard shots of crew of cable-layer "HMS Monarch" at work laying cable, splicing it, tending machinery, watching cable as it slips over pulleys and overboard. Interior shot of captain's office, captain working on his report. CU of electronic slackometer unit, of turning wheel on deck. HAS of cable being coiled in large loops on bottom of barge. Shots of pilot house, of Ensign flying, of bow of ship as float markers are let down into water. HAS of ship's forecastle ploughing through rather rough seas. Several CUs of cable, pulleys.