What resource makes Europa the primary target for water and life sustenance materials?

Answer

A massive subsurface ocean of salty water

Europa is highlighted because it almost certainly harbors a massive subsurface ocean of salty water, making the ice crust and the ocean the primary resources of interest.

What resource makes Europa the primary target for water and life sustenance materials?
SpaceresourcesJupiterexplorationPlanetary Sciencespace explorationmoons