*minor starting game spoilers*
I'm at the mission where you have to get c4000 to try and blow up a part of a dam. I went to the indicator which put me underwater, if I go to the surface I fail the mission. If I go 20m to the left right front or back I fail the mission. If I do nothing for 15 seconds I fail the mission. The indicator is pointing for me to go into the ground.
What is going on and where am I supposed to go?