Once you get the Banshee to the next part of Metropilose were you would get the scarab gun, fly past the bridges and you will find a whole new world! Also, fly it into the water and you can walk in the water.
Below the bridges is a large open area with a few weapons but hardley any ammo and there all scattered around. Behind that large area is a ocean, use the banshee to go into the water and you will walk there, but it doesn't seem like your in water. oh and if you kill the guy that says, "When I asked for reinforcements, I didn't think they'd send a spartan." Find the water place again and his bodyd will be stuck in a wierd glitch.
