My buddy and i are planning to dive at a site at a site where the water and air temperature are near freezing. We plan to dive to 18 meters for 30 minutes. What dive profile would we use when planning our dive

32 minutesUsing RDP Table 1 find the depth on the top row - 18m/60ft - and follow the column down to the time or next greatest time - 34/33 - go across the find pressure group M. In RDP Table 2, follow M to find 30 minutes (between 26-32 minutes) and follow that column down to pressure group H. Go to RDP Table 3, follow the next deepest depth - 18m/60ft - across to meet H. The number in the blue box - 32 - is the allowed bottom time.