Actually,the unmount system on the game is very unfair,especially on high level ship,as the upgrade cost can be 100 or 1.000.000 that unmounting will only cost 10 gold,which is unfair as if you upgrade wrong equipment or a bug occurs,like a member of my fleet,that upgrade 3 gun on Iowa and the upgrade turned into 3 engine,you will get nothing back,everyone makes mistakes,and you should get half the steel(To don't be OP) you used back after unmounting equipment,making easier to undo wrong decisions and bugs.