Help don't know how to kill this underwater boss

[Martylang]

I am controlling a submarine don't know how to kill this underwater boss.


http://steamcommunity.com/sharedfiles/filedetails/?id=100655858

[Martylang]

ok I found out myself after a while. There is 1 crate you can move through the *maze* to drop on his head.

[Kiwoui]

go to north =) need to push Box , press C et look north you have Box