I went back through the real series mod and am on the lower level in the water of the forgotten office does anyone know how to open the door just above the water?

Does anyone know how to get out of the sewer in the training part of “the real” mod? There is a door that I am unable to open. I can’t figure out what I am missing. It’s making me Krazy!!!!

Does anyone have any information on how to get through the training course?