Question

How were the three men saved in 20,000 leagues under the sea?

Answer 1

They were saved by being held up by the "monster", and they climb in with the crew of it.

Answer 2

The Three men's lives were saved as they were held above water by the monster which they discover to be a modern submarine, named the Nautilus, as they climb inside they come upon the submarines captain and his crew, his name is Captain Nemo (as i recall).