its early in the game ... i took a tunnel and and it led me to an air duct which dropped me on top of a lot of stacked barrels in large room ... the rooms floor is wire meshed ... I was attacked by a lot of those flying blade things ... now there is ladder that takes me down to a water enclosed room with a large opening but cannot get to it from the water ... the only opening I see is @ the top left corner but cannot get to it ..... help please