Europa is a moon of jupiter wich lies beyond the asteriod belt!
So why not use the asteriod belt? Asteriods contains the rust-free iridium wich is rare so why not that you need to go to the asteriod belt and get the iridium? You will need to mine the iridium smelt it and make plates out of it for the tier 3 rocket. Hope you enyoyed the idea PEACE.