Check out this Spaceref.com piece on the oceans under Europa’s ice crust. If sulfur and hydrogen are big part of the picture on Europa, that sixty-mile-deep ocean might be an acid bath. Sulfuric acid, that is.
Count me as a member of the minority that doesn’t believe we’ll ever find life off planet Earth.
On the other hand, it’s not impossible for life to develop in extreme environments. Those hopeful of exploring for life on Europa should get their chance. I suspect that all of the universe’s natural wonders will lie not in biology, but in the realms of geology, chemistry, and physics. But I wouldn’t mind being proven wrong on that score.