Work limits: 190 fsw

Emergency air supply (EGS) required deeper than 60 fsw or diving inside a wreck or enclosed space

Current - Above 1.5 knots requires extra weights

Enclosed space diving requires an Emergency Gas Supply (EGS) with 50- to 150-foot whip and second stage regulator.

Operational Considerations:

1. Adequate air supply system required

2. Standby diver required

MK 21 MOD 1 Helmet.

Figure 6-25. MK 21 MOD 1 General Characteristics.

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