I saw this question and this question on the site a few days ago. It asks about escape velocity from the water-based planet in Interstellar and whether the black hole had any effect. Now, one question is unanswered whilst the other has an answer focussing on the effect of the black hole (it said the effect was non existent.
My question is: If the black hole had no effect, then does the fact it was a water based planet mean it is easier to achieve escape velocity, or harder?
I'm aware leaving the water planet is one of the contentious parts of the movie. If anybody has any further comments on its possibility, I'd love to hear them.
Edit: for anyone unfamiliar with movie, gravity on water planet is 1.2 times that of earth. We've no idea what the planet is composed of, other than it is entirely water, roughly thigh deep.
On a final note, I'll add that I'm an active member of the Movies & TV Stack Exchange. I'm asking this question here as we've had a plethora of questions there about issues like this and frankly none of us are physicists. Therefore, I'll cheekily request that answers be kept on the simple side!