Sinkhole

Choose the mothership battle or an expedition that has crew in it, once crew are dispatched. Every crew there is destroyed, both players': hull and plating don't matter. It counts as being destroyed, so cards like Tunnel Rats are removed from the game, and markers are lost (801.9).

While it is in your scrapyard, you may deploy it from there for this cost instead of its own, whenever you could deploy it from your hand. It goes into the crossfire, and the opponent may react. Deployed from your hand, it goes to the scrapyard as usual, so it can be used again this way.