A submarine can hide beneath millions of square miles of ocean. HMCS Regina was built to find it. I went aboard the Royal Canadian Navy’s Halifax-class frigate HMCS Regina during RIMPAC, the world’s largest international maritime exercise, to learn how this ship hunts submarines, defends itself from missiles, launches helicopters in rough seas, and survives when something goes catastrophically wrong. We’ll examine the CH-148 Cyclone helicopter, CANTASS towed-array sonar, SMART-S radar, Harpoon and Evolved Sea Sparrow missiles, the 57mm Bofors gun, MASS decoy launchers, torpedo systems, damage control—and Canada’s wonderfully named Beartrap helicopter-handling system. But Regina isn’t merely a collection of weapons. It is a floating power plant, airfield, sensor network, command center, fire department, hospital, and home for roughly 225 Canadian sailors.

Source: Canada’s Halifax – Class Frigate Is More Dangerous Than It Looks