tidal current
deep ocean currents.
tidal current
A submarine does not have to move under its own power when submerged. It will however move with the water currents that surround it. Just like a hot air balloon moves with the wind (air currents).
Bottom currents move too slow.
A submarine cannot go to the bottom of the ocean because the pressure at such depths is too high for the submarine's structure to withstand, risking damage or collapse.
You have to bring the word submarine down to the bottom of the screen.
If a submarine takes on enough water, like any vessel, it'll sink straight to the bottom without intervention.
hydrogens
they are both at the bottom of the ocean full of seamen
The answer to the location of the submarine is B.
from the bottom of the earth
"They move along the bottom."