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Figure 6-23. Scuba General Characteristics.

MK 20 MOD 0 General Characteristics

Principle of Operation:

Surface-supplied, open-circuit lightweight system Minimum Equipment:

2. Harness

3. Weight belt (as required)

4. Dive knife

5. Swim fins or boots

6. Surface umbilical

Principal Applications:

Diving in mud tanks and enclosed spaces Advantages:

1. Unlimited by air supply

2. Good horizo ntal mobility

3. Voice and/or line-pull signal capabilities

Disadvantages:

1. Limited physical protection Restrictions:

1. Work limits: 60 fsw

2. Current - Above 1.5 knots requires extra weights

3. 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 20 MOD 0 Helmet.

Figure 6-24. MK 20 MOD 0 General Characteristics. CHAPTER 6 — Operational Planning

MK 21 MOD 1 General Characteristics

Principle of Operation:

Surface-supplied, open-circuit system Minimum Equipment:

1. MK 21 MOD 1 Helmet

2. Harness

3. Weight belt (if required)

4. Dive knife

5. Swim fins or boots

6. Surface umbilical

7. EGS bottle deeper than 60 fsw

Principal Applications:

1. Search

2. Salvage

3. Inspection

4. Underwater Ships Husbandry and enclosed space diving

Advantages:

1. Unlimited by air supply

2. Head protection

3. Good horizontal mobility

4. Voice and/or line pull signal capabilities

5. Fast deployment

Disadvantages:

1. Limited mobility Restrictions:

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