If scuba divers use inflatable BCDs (buoyancy control devices), why don't underwater robots? Well, an experimental new one does, and the technology is said to be much more energy-efficient than ...

Nuclear submarines look like ships on the surface, but underwater the physics changes completely. This breaks down how they control buoyancy and stability, navigate without GPS, run on silent electric ...

Body shape had a clear influence on energetic demand. Deep-bodied fish, with their larger surface area, generate more ...