A1: Break through the bars to a tunnel then go into the room with the fan (don`t get sucked into the fan)then destroy the 2 pipes on both sides of the fan

A2: Go to the sunken sub,green on your radar, grab one of the rusted torpetos off the bottom and swim over to one of the pilers. while swimming over hold your carge button and when close to one of the platform pilers release both buttons at the piler also stop swimming. Repet until complete.

A3: When you get to the ship part dont bother with the radar do what the second person did and pick up 3 torpedos and launch them at the ship oh and your probaly wondering y you keep on dieing when at the platform it because of the cam thing that have a ballon thing at the top of it so bite all 4 of them to make them stop shooting

A4: Wat you need to do is turn on your shark vison then go to a platform with the shark vison on when you see lights dont let them see you or they shoot like the last guy said bite all 4 ballons then when the coast guard throws bombs make sure there refular bombs and not electric exploding bombs and do the same for each pkatform till there all gone if there are still some bombs kill the coast gurad or they will get more bombs to kill you then go to the tunnel then when your inside by a big fan destory the huge pipes by the fan but becarful not to get sucked in by the fan and you only have to exits when it come the time to leave after destroying the pipes then just wait for the movieclip and go to the next red dot but explore around you will find tresuare in the ship that is cut in have chaeck both halves in side to find a can and in you look where the tunnel is look by a rock wall and then find a steel bar wall break it and you find another can then look alll around the place for a tresuare chest I found 2 in there hope this info helpsand good luck with the rest of your game