People love making fun of the bad orbital mechanics in Gravity, but Interstellar is no better. In the beginning they need a Saturn V-size rocket to leave earth orbit. Later they simply decide to leave the laws of physics behind and start zipping around earth-size planets in a tiny scifi-shuttle. Not to speak of the impossibility of kilometer-tall waves in knee-deep water and the ridiculous spinning spaceship scene.
>the impossibility of kilometer-tall waves in knee-deep water
FWIW I think those were supposed to be some sort of extreme tides due to the black hole. Maybe still impossible, but I don't think it was just "Big waves are cool lol".
Yeah, the whole planet was essentially an ocean, but the gravity of the black hole was such that it was pulling all the water to one point. With the spinning of the planet, it was essentially a wave.
Basically, the water was acting as a comet's tail does. But backwards.
FYI, The world's largest tidal range of 16.3 metres (53.5 feet) occurs in Bay of Fundy, Canada. Tidal forces in extreme gravity and with the right subsurface geometry could be huge.
