Lanefan
Victoria Rules
I agree with the first paragraph: the mechanics for sorting that one out aren't written down.There are no established mechanics, in AD&D, for resolving the action declaration I seal the doors, unleash my Decanter of Endless Water, and float up to the same level as the eyes in the statute so that I can pry them out.
Resolving this action declaration is not a logical operation of the sort involved in resolving the move of a bishop in chess.
I disagree with the second, however, in that a 1e DM could still approach this resolution in a logical (if fairly granular) manner.
Were someone to declare this in my game, after congratulating the player's creativity I'd handle it more or less thusly (assuming none of these parameters are already known):
1. I'd ask what if anything you were specifically doing in order to seal the doors other than simply closing them.
2. I'd check the map-and-key to see if it tells me about any other entrances, possible drains, etc. the PCs haven't yet noticed
3. I'd have the player roll for success on sealing the door, on a sliding scale where 1 means it's still a sieve and 20 means a perfect seal.
3a. If there's any unknown exits I'd quietly roll for the water-tightness of each
4. I'd calculate the approximate volume of the room up to the height of the statue's eyes
5. I'd work out roughly how long it would take your Decanter to fill said volume with water, assuming no leakage out of the room, then adjust for leakage if any
6. Somewhere along here, if not sooner, I'd ask if your character can swim; and what it's doing with any heavy and-or water-sensitive gear it might be carrying (and if necessary deal with any consequences of said gear getting soaked)
7. As the room fills I'd quietly roll a saving throw for the doors (particularly if they open outwards!) to see if they can hold back the pressure
8. Assuming all has gone well so far, we'd deal with the actual extraction of the jewels
9. Now that you've sealed yourself in and buried the door under feet of water, I'd inquire as to how you intend to escape this chamber.
