Minimum Required Surface Interval
Table 3: Repetitive Dive Table
For example, a dive team has just completed a dive and has a letter group of "D." Now they want to dive to 47 feet and have a bottom time of at least 55 minutes. So how long do they need to stay at the surface before their next dive?
We begin by locating the appropriate column for a 47-foot dive, which is the 50-foot column. Then we follow that column down until we find an adjusted maximum dive time that's at least 55 minutes long.
The first letter group that allows an adjusted maximum dive time of at least 55 minutes is "B," which allows a 57-minute dive. So the divers need to become "B" divers before beginning this dive.
We begin by locating the appropriate column for a 47-foot dive, which is the 50-foot column. Then we follow that column down until we find an adjusted maximum dive time that's at least 55 minutes long.
The first letter group that allows an adjusted maximum dive time of at least 55 minutes is "B," which allows a 57-minute dive. So the divers need to become "B" divers before beginning this dive.
