I am stuck in the water hazzard just before black mesa east. There is a ramp to the left that comes from under the docks and one to the right that leads into a pipe. There is a wrecked boat in a pool. There are 2 rocket vehicles firing at me. The only way to jump the ramp is to get behind the dock poles but I don't see an opening. If I leave the boat and walk I can get into the pipe. I follow it and it loads a new level and says welcome to black mesa east. Am I supposed to leave the airboat at this pipe.