[TheBeast]

Originally Posted by SteelViking

Like I said, there are only certain conditions under which it would be totally dark, so I basically agree with TheBeast. However, as far as bio-luminescence is concerned, the plankton does not stay at the surface and illuminate the environment unless it is churned up by a large ship, such as an aircraft carrier. That is why you hear of large ships having glowing trails behind them.

Edit: I mean absolutely no disrespect TheBeast by the way.

None taken.

If the sea is chopy with white caps, the bioluminescence is everywhere, not just behind large ships. Anywhere the plankton exists, if the water gets chruned, either by ships or churning wave action. You can see the bioluminescence and when iat sea far away from any other light sources, the bioluminescence is very bright.