The incident occurred Tuesday afternoon when maintenance workers discovered a leak in a 65,000-litre propane tank stored at a facility across the harbour from the busiest part of the naval base.
Capt. Jenn Jackson says the tank was about half full when the leak was found, but she couldn't say how much propane had leaked.
A one-kilometre area was cordoned off and non-essential personnel within 800 metres were evacuated.
The leak was plugged by around 9 p.m. and there are no reports of any injuries.
CFB Esquimalt says a full investigation will be conducted into the cause of the leak, which may have happened during a training exercise at the base's Damage Control Training Facility, where personnel are taught flood control and shipboard firefighting techniques. (CFAX, The Canadian Press)