Where to Use Double Jump

[40GallonTophat]

Hi guys,
I got the double jump and I've been all over the map and can't figure out where to use it. There's like 5 the reinforced doors, like 5 areas I can't get to without crawling, a few areas with those skeletal walls, but no where I can see to use double jump.

Thanks!

[After Death]

Hi 40GallonTophat,
The double jump can be used in the cimetery to reach some platforms,it's not far from the save room , on the upper left side.
Let me know if you need more details