Corvettes and frigates under construction: HAS, PAN and static shots of a corvette under construction, plates being swung into position by a crane, lifeboat being installed. CUs of welder at work, riveter. Man heating rivets tosses a red hot rivet to riveter who deftly catches it and puts it into the drill hole. Another man uses riveting tool on it. LAS of mast, funnel, worker on spar. A painter is shown wearing a mask as he paints. LAS of funnel, steam escaping from outlet. Cut to two men pulling on a rope as the corvette gets ready to go out for the first time. A naval officer and workman are shown on the bridge near the binnacle. HAS of ice floes on the river as seen from a moving corvette. Workmen can be seen standing at the railing in the lower foreground. MS of Red Ensign. Cut to vertical HAS of the anchor being pulled up and cut to the winch in operation as workers and naval officers stand by. HAS of the water from different positions on the ship, the shore of the Saint Lawrence, heads of workers in the foreground. HAS of the shadow of the flag on white water near the ship. Cut to CU of a naval officer on the bridge and PAN along wake of the ship as she turns round to return to port.