As I proved a few pages back, it's not against forum rules to post standard physics formulas and solve them. You tell us you solved the problem of
MS Estonia sinking hydrodynamically through water, via an "online calculator" that used a "standard formula" and prompted you for values for its various parameters. I'm not sure why you think the answer you presented for
hydrostatic pressure was relevant, but for now we'll just assume that's explained by too much kimosabe on your sushi. You get another shot.
I'll represent that this is the standard formula in physics for the drag force on an object that results from that object moving through a fluid.
You take it from here. "Plug in" the same values as you did before for the sinking
MS Estonia and recreate your answer.
Oh, whoops, I forgot something :—
I'm looking in vain for any sort of "gravity bit" in the standard formula. Standardly, fluid drag is independent of gravity. But you tell us a "gravity bit" was required, so put it in there where you think it should go.
Alternatively, if you think this is the wrong formula, supply the right one and solve it using your prior parameters.
Alternatively, if you think more is required than this one "standard formula," tell us what and provide the associated rigor.
If you're seeing this, it means that posting and solving physics problems is A-okay according to the forum rules. So rev up that triple-niner, "five years of physics" brain and dazzle us with your mastery of the hydrodynamics of a sinking ship. As you say: