A user on Scubaboard posted that he and two Advanced Open Water/Nitrox Certified buddies were planning to do a wreck penetration of the Spiegel Grove wreck. He then posted a video of an instructor, his sister and himself diving the wreck.

If you are a divemaster candidate, or a rescue diver, watch this video at speed, then note what you've seen, then go back an pause the video each time the camera looks at a diver and see what you missed (hint, there's a lot!). Once you've done that, we can compare notes here.