Ah, well, quite late to the discussion... but:
Some dive ops will bait Nautilus pompilius / Chambered Nautilus in deep water and bring them up in the trap, releasing them in the morning at shallow diving depths. This seems controversial, and some claim they have tagged animals and recovered them on subsequent dives, others state this is harmful to the animal.
I do know they come up to shallow dive depths. On a trip on NAI'A in Valuantu, we were doing some expedition diving and a few of us did a night dive in very deep water off the east coast of Malekula Island (very steep dropoff) on a moonless (new moon) night.
At 55 feet, we weren't seeing much, when I saw a light shape with my peripheral vision. In the end we spent perhaps twenty minutes with a half-dozen N. pompilius, non-baited, and were careful to partially illuminate them with only the edge light of our torches. Back on the boat, it was, er, "interesting" to see peoples' reactions - including Rob Barrel and Paul Humann. :shocked2:
I consider this a dive of a lifetime, unique and probably not replicable. Memorable, though! (Then again, I am a hopeless critter geek and get excited with brotula sightings.)