Intelligent Life May Be Hiding in the Moons

Definitely, since I was a little kid I have been imagining whales swimming in Europa's underground oceans, only waiting for us to drill a hole deep enough to find them.

Can anybody who's looked into this topic further tell me why this may not be the case? Would the pressure down there be too big, would it be too cold or what other possibilities could prevent a planet with oceans to manifest life?

If you think of every super-Jupiter in the Goldilocks zone around their stars as the host of half a dozen Earth-sized moons, the number of possibly inhabitable worlds in the galaxy grows by a factor of half a dozen.

We really need to find a way to travel faster than light. I don't want to wait a thousand years to be able to study these places.