What is the best way to: How to properly house a whale?

Options are:
--House it is a water proof closed tank filled with water, keep the top closed so that the whale can breathe.;
--House it is a water proof open tank filled with water, keep the top open so that the whale can breathe.;
Answer:
House it is a water proof open tank filled with water, keep the top open so that the whale can breathe.