http://memory-beta.wikia.com/wiki/Novel Interaction with special water based entryway and the rest of that deck.

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When Riker and Troi where near her special "water-lock" entryway from her water filled quarters to the regular air class M deck, Aili Lavena turned to them said to them, "I hope that didn't startle you, some 'land-living folks' can find it odd sounding." Also Troi pick up her husband reaction that she (Aili) was one of his former lovers

"water-lock" entryway and special built water filled quarters.

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It sounds like a humanoid toilet, flushing as the water enters/exits the "water-lock" Also if the special force fields failed, Troi said that that section of the desk, would have completed closed off, or the water would flood the whole deck.– GinnyStar-STD MOT 21:16, 30 July 2009 (UTC)