Some videos for quiet hours:
on Planet Thalassa, a french TV channel with short beautiful diving videos around the world (click in the right column on plongee TV);
schwerelos im Roten Meer (Red Sea), 5 min (when I was there, it was exactly like that);
scuba divings in Thailand and Burma, 6.34 min;
with dolphins in Honduras, 6 min;
scuba diving Okinawa, 7.58 min.
dive with Blue Marine 3, 9.23 min.