inch pvc air ballast line with starboard forward ballast control valve 134 refers to air supply line vent line starboard forward ballast flotation tank 136 refers to air supply line vent line port forward ballast flotation tank and 137 refers to a u00be inch pvc air ballast line and starboard aft ballast control valve the raising of the flotation module 100 in fig3 a 3e will now be described in the following ten 10 steps 5 flotation tubes tanks 38 39 and 34 35 fill with air ballast water is expelled through exhaust flood ballast tank tubes 48 6 flotation module manifold end fig3 e rises tilting internal water to drain plug end 101 7 outward flow of water from drain plug 101 ceases 9 open valves 130 and 137 to fill aft ballast tubes tanks 33 and 37 with air 10 aft end of tank 33 37 begins to rise to same level as front of tank 35 39 expelling remainder of water in flotation module 100 out drain plug 101 the lowering of the flotation module 100 in fig3 a 3e will now be described in the following fifteen 15 steps 5 air expels from valve 123 as water floods aft ballast tubes 33 37 through exhaust flood ballast tank tubes 48 6 module 100 tilts toward drain plug 101 opening and begins to submerse on aft end while water floods in through drain plug 101 7 air stops venting through valve 123 during complete flooding of aft ballast flotation tubes tanks 33 37 8 valves 130 137 and vent valve 123 are left in open positions 10 air begins venting from vent valve 123 as air expels from front ballast flotation tanks tubes.