Mission #9 on russian side

[Mitch24]

Hey everybody, i've done pretty much all mission for russian, I'm at the last mission(i think) where you need to get in a submarine to get paper, but now the submarines is lock, i need too use the Blowtorch, and i dont know how to use it!!! I'm currently on it, like a piece of Artillery, and dont know what to do, im on the ship, i move it all arround and i can't figure how to use it.

Please help!!!