The following account was recorded in the agent's log during your transmission: Rocks are arranged in a seemingly deliberate, spiral pattern on the bottom of a perfectly still, crystal-clear lake, like... nobody's disturbed the water in centuries or something. The air pressure's pretty high down here, but I can taste the freshness of the surrounding water. Uh, a faint, pulsating hum seems to be originating from the rock arrangement itself, echoing off the nearby underwater cliffs. A halo of iridescent, pulsing plankton has coalesced around a totally intact, ornate door - it looks like a Tibetan thangka painting come to life - lodged in the rocks, somehow... ajar, revealing a dark void beyond.