Hi

I agree that a mission to Europa should be a high priority.

However in my opinion, it will be at least 50 years before a mission is developed that will search for life in any subsurface ocean.

Before this mission is developed, there will need to be scouting missions to first confirm the existence of a subsurface ocean, and to probe the thickness of the ice to find a suitable place for any lander to do science.

As for breaking through the ice and exploring any subsurface ocean - I'd say thats about 50 yrs away.