HANDLING CHARACTERISTICS 109 



11. Assuming that all vent, flood, and equalizing valves are shut, open one vent valve on each 

 of the main ballast tanks. 



12. Open the equalizing valves Bl and B2. This will equalize pressure between the ballast 

 tanks and the living compartment. 



13. Charge Sealab with air to 20 psi gauge through the gas supply line of the umbilical. This 

 will keep all hatches and battle covers tightly secured. 



14. Flake umbilical around conning tower. 



15. Close all valves except A9 and any valves necessary to supply air to Sealab via umbili- 

 cal while under tow. 



16. Attach towing rig. 



17. Energize towing lights. Sealab is now ready for tow. 



18. Take Sealab in tow with speed not to exceed 4 knots, following shallow water coastal 

 route. Have two men from the Sealab program aboard that know Sealab and its systems well. 



19. If alarm shows air loss, resupply air via the umbilical. In the event Sealab starts to 

 sink, head for the nearest shallow water and beach it. 



