It's rare that an encounter with a crab leads to an innovation in transport but that's just what happened to ocean engineer Graham Hawkes.
While testing one of his many designs for a conventional submersible he came face-to-face with one of the little critters.
"I remember stopping and laughing," Hawkes told The Huffington Post. "But I thought, 'That crab has got it all wrong. These fish are moving in three dimensions. This guy is scurrying along the bottom. So am I. We've both got it wrong."
And so the DeepFlight Super Falcon was born, a craft that "flies" through the water rather than sinking.
Hawkes said: "What we're doing is really, really obvious,"
"There's nothing that clever about it. We actually build a thing that has wings, we build up speed, and it just flies underwater.
"Ninety-four percent of life on Earth is aquatic," he said. "We live on an ocean planet. We need to understand that. We need to be connected. This is a tool that can do that."