We aren’t sure how this concept works but researchers at Beihang University claim to have developed a small, battery-operated, underwater drone that can not only withstand the pressures of the Mariana Trench but uses the pressure to propel itself.
The drone can also change its shape for various tasks, like using its fins to swim and glide through the water and then switching to legs for crawling along the ocean bed, like a crab.
Full article at: TheSunUK 25mar25