I'm working on a story involving life on Europa being upturned dramatically by contact from a probe sent from Earth. Found this community while researching, and have found a lot of great ideas. I know the chances of life, let alone intelligent life, are pretty slim on Europa, but I'm ignoring that for the sake of the story. The driving force of the story is that a probe that's come from Earth crashes/malfunctions after melting through the ice.The probe sinks to the bottom of a trench and sets off some sort of ecological disaster/collapse, that then has cascading effects on the civilizations living there. In retaliation, a fairly advanced society that has adapted to living in the ice (most of society is less advanced and lives on the sea floor), makes plans to retaliate against the Earth by breaking off a chunk of the outer ice crust and hurling it at Earth.
I know that's kind of crazy, but I'm trying to gauge HOW crazy, and if it can be explained reasonably (not that they are necessarily acting reasonably/rationally). I'm thinking they would be able to freeze, or otherwise build a barrier around the area that's going to be broken off, to sort of protect most of the rest of the moon from being destroyed or sucked out into space. They then break along an area of the ice all the way through, and let the force/pressure of the ocean pushing up 'throw' the ice where they want it to go. It is supposed to be somewhat of a desperate move where the ones working on the project think they have nothing to lose, and aren't concerned with the fact that it would definitely cause a lot of damage to the moon, so long as they survive.
My question is whether this is even remotely feasible, or if I have gone completely off the rails?
Thanks for your help!