152 OPERATIONAL AND EMERGENCY BILLS 



7. Swimmers will not venture outside established perimeter except in cases of emergency, 

 and then with permission from top side. 



8. Communications will be maintained. 



9. An accurate depth gauge will be worn, and no ascents above 33 ft from the Sealab en- 

 trance water level will be permitted. Routine descents greater than 33 ft are also prohibited. 



10. Swim groups will carry a pinger receiver to home on the habitat. In zero visibility a 

 life line will be carried from the habitat. 



11. All divers will be negative when breathing bags are extended. 



12. SPU operations will be under supervision of Officer in Charge. 



13. Buddy-line communicators or buddy lines will be worn by swim pairs unless permis- 

 sion granted otherwise by Officer in Charge. 



14. Bounce dives of greater than 33 ft will be conducted only upon control and discretion of 

 the surface command center. 



MK-VI MAINTENANCE BILL 



Each subject in Sealab will be assigned a Mk VI breathing apparatus for excursions outside 

 the dwelling. Daily maintenance of the Mk VI will be the responsibility of each individual. 

 After each use perform the following maintenance procedures on the breathing apparatus. 



1. Thoroughly rinse the Mk VI with clean, fresh water until all foreign matter is removed. 



2. Inspect inlet filters of regulator, assembly, regulator aneroid chamber, diaphragm 

 (once each week), control block assembly, safety rupture disk, exhaust valve assembly, and 

 "buddy -breathing" assembly for foreign matter and contamination. 



3. Inspect all rubber components for deterioration, cuts and nicks, and replace parts as 

 necessary. 



4. Check for smooth operation and return of bypass valve by pulling bypass lever. 



5. Inspect all cloth material components for breaks and excessive wear. 



6. Separate cylinders and manifold valve assembly from breathing bag and vest assembly. 

 Send cylinders and manifold valve assembly topside for recharging. 



7. Dump CO2 absorbent from canister and wipe clean. If canister has been flooded, wash 

 thoroughly with fresh water and dry. 



8. Remove exhaust valve from bag assembly. Hang bag assembly and mouth piece "T" 

 tube assembly and let dry. 



Preparation of Mk VI for excursion: 



1. Check gas pressure and02 percentage in cylinders, making sure they have been properly 

 refilled. 



2. Secure yoke assembly, regulator assembly, control block assembly and properly filled 

 canister assembly to the apparatus. 



3. Check regulator assembly and control block assembly for proper pressure setting and 

 flow requirements. 



