They can be 'navigated'
The diver explored the deep ocean trench to study exotic marine life.
A waterway deep and wide enough for a vessel is called navigable.
Deep enough to float your boat.
an ocean
A boat can travel between Australia and New Zealand, but it will need to be fully deep ocean capable.
Navigable
Navigable
A plane and a boat can both travel around the globe, assuming that the plane has enough fuel for the trip and that the boat travels a path with open waters.
Any river that is deep enough, (more than a couple of feet) and there are no no local restrictions on power boats.
To travel by sea on a boat.
Deep