This is simply what I would imagine a door slamming under water would sound like. Yes, I know that’s not something that could physical happen, but let’s use out imagine!
I layered a couple of different door sounds with a couple of layers of bubbles. The doors were from a library, but I recorded the bubbles by using a straw to blow air into a large bowl of water. I then added a low pass filter, reverb, and some bass enhancement to bring it all together.