Quote:
Originally Posted by thenry
trial and error or incompetence? surely they would have known how deep the sea is.
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Much of the deep ocean covering the planet hasn't been mapped in detail, certainly not enough detail to be used as navigation charts. Besides, fleet submarines don't operate that deep so there's never been a pressing need for such an accurate view of the surface up until now.
I'm assuming that Bluefin 21 uses some kind of terrain following system to remain a certain height above the seabed hence this safety mechanism kicking in.