This is true but with the proper precautions one can take measures to reduce the risk. Never to complete zero of course and it will probably always be relativel

This is true but with the proper precautions one can take measures to reduce the risk. Never to complete zero of course and it will probably always be relatively dangerous to travel underwater. But it's already dangerous to travel in a minimal atmosphere, in a pressurized vessel, at the speed of a bullet, and it happens everyday via air travel. More work in the field from pioneers like these students will help reduce the risk for future travelers.