Select Diving Technique

The three main types of air diving equipment used in U.S. Navy diving operations are (Figure 6-13):

Figure 6-12. International Code Signal Flags. CHAPTER 6 — Operational Planning

6-21

1. Open-circuit scuba

2. MK 20 MOD 0 surface-supplied gear

3. MK 21 MOD 1 surface-supplied gear

Figure 6-13. Air Diving Techniques. A choice of three air diving techniques are available: open circuit scuba, surface-supplied gear (MK 20 MOD 0), and surface-supplied deep-sea gear (MK 21 MOD 1).
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