Will just note that a possible time line is that Diver A goes in at 12. Other diver does a dive at 1. Diver 2 comes later from his dive what say 2-2:30. They see no Diver A. Look for bubbles. Do not see any. Realize that Diver 1 has been down for 3 hours and is no longer alive. They do not have resources to look for body. That is understandable. Question is why not report it when they did realize.