A Canadian autonomous underwater vehicle has quietly redrawn the map of what hydrogen power can accomplish. In late April 2026, Burnaby-based Cellula Robotics announced that its Envoy submarine drone, formerly known as Solus-LR, completed a fully submerged voyage of 1,257 miles powered exclusively by hydrogen fuel cells. The 385-hour mission, which involved more than 4,000 maneuvers, did not just exceed the company's own published specifications. It cracked open an industrial
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