Well, the college I was at, got a grant. They were going to throw it away, so I asked if I could have it.

That's not how things work, especially with something so expensive, but I'll let you have this one because the rest of your story doesn't add up

took all but 3 keys off, using a wood putty to fill all the other holes.

Nearly all the keys come off in chunks, so it's not particularly easy to leave just three keys on and doesn't even make sense mechanically

Used a trumpet mouthpiece and a cork where the bocal goes which was connected to a tube that ran all the way down to the bottom where the water was.

A trumpet mouthpiece is much too large for the hole where the bocal goes, let alone with a cork. The bottom doesn't fit more than about two tablespoons of water before it spills out anyhow

When you hit it, the suction would pull the keys down filling the main tube.

That's not how physics works, especially at the height that the keys rest at. Besides, there's no "main tube"; it's all one tube

You would then kick the back bottom key releasing the other 2 in stages as you inhaled.

There's not any key on the bassoon that releases other two keys in stages. There isn't any key that even covers holes between the bottom of the bassoon and the bocal. All of the holes between the bocal and the bottom are finger holes, not keys. The only keys that cover holes on the bassoon are the very bottom, where the tube bends (and also where the water would all spill out), and on the back, which is after the bend and past the water in your imagined contraption.

Even beyond all those ridiculous statements, the tube in a bassoon is just over nine feet long and a bitch to pull even with the holes uncovered. There's no way you could get a reasonable hit out of that.

Don't try to bullshit me on the bassoon. I've been playing for 11 years now. I know the instrument inside and out.