The course of action set, the party makes preparations to see what lies beneath the pool of murky water.
Kalen intones the words of a spell, and several dancing motes of light wink into existence and float nearby. (Cast Dancing Lights) The party then ties a length of sturdy rope around the beguiler's waist, and Chongo and Keoni take hold of the end, hoping their strength to be sufficient to pull their companion back out, should something go amiss. With these preparations finished, Kalen nods and plunges into the water.
The pool of water is not so cold as Kalen expected, though it is a bit rank. The elf wades, unmolested, out to the deepest part, then with a grimace, takes a deep breath and dives beneath. With the nimbus of his dancing lights aiding his keen vision, Kalen gets a good look at the depths of the pool. This water appears to have flooded the chamber through various cracks in the wall and floor. It only takes a few moments to determine with conclusivity that there is no point of egress to be found here.
Moments later, Kalen stands on dry ground once more, his fine clothing sopping wet, and feeling the need for a good, hot bath.
What next?