>> Consult magic 8 ball on what to do next, go to the yellow door, or explore the cavern?

The MAGIC 8-BALL is thoroughly unhelpful.

>> Explore cavern
>> Check that cavern.

You climb down to the CAVERN to check it out. WATER continues to flow out of it, and the WATER LEVEL continues to decrease.

It's just a simple TUNNEL, really. You switch on the LIGHT on your BUCKET MINING SANTA HELMET and plow forward.

>> use BUCKET part of BUCKET HAT to collect WATER.

You take the BUCKET out of your BUCKET MINING SANTA HELMET and use it to collect some WATER before it all drains away. You don't really know what kind of help it might be, but hey, if you get thirsty, it seems fresh enough you guess?

Oops, you have no INVENTORY SPACE. It looks like you'll be carrying this WATER-FILLED BUCKET around for a while.

After quite a long walk, you eventually reach the end of the TUNNEL, at which point there are METAL RUNGS connected to a STONE WALL. By now, there is no longer any STANDING WATER, and the ground is simply damp. You climb the RUNGS.

You resurface inside BURAM VILLAGE's WELL. Apparently the WELL'S UNDERWATER PASSAGE led to an area under BURAM CASTLE? We'll never know now.

As a side note, the WELL is now devoid of WATER. Oops.