At the end of Mumbo Jumbo's "Making an Aquarium Door in Minecraft" (https://youtube.com/watch?v=ypxrd8EtRzQ&t=2s), he challenged his viewers to make a version of the door with drowned which is possible in survival.

This is that door

This is also my first time playing vanilla minecraft since 1.8, so it's not super optimized. I'm much more used to mods like redpower for this kind of work.

P.S. I built this quite a while ago at this point, but only uploaded a video of it. A commenter requested a download, so I literally made this account just to post this.