Half a croissant, on a plate, with a sign in front of it saying '50c'
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Underwater Hullaballoon

Simplify hullaballoons and pour water on them.
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An underwater hullaballoon would not require the lifting gas to be pumped among the balloons, as their size variation would be caused directly by the pressure gradient of the water.
spidermother, Apr 10 2011

hullaballoon Hullaballoon
[spidermother, Apr 10 2011]

Self_20pumping_20snorkel Inspired by annotations here [spidermother, Apr 10 2011]

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       [+] picturing a Ferris-wheel contraption to get maximum pressure differential.
FlyingToaster, Apr 10 2011
  

       It was always a yellow submarine like vessel.
rcarty, Apr 10 2011
  

       If such a vehicle were operated at such a depth that the balloons reached the surface, they could be used like a bucket brigade to bring fresh air down to the vehicle in a very energy efficient way, by using the buoyancy of the expanding, ascending, stale air balloons to counteract that of the contracting, descending, fresh air ones.   

       An arrangement would be needed to empty and refill the balloons, at both the top and the bottom of the cycle, but it would operate across a very small pressure gradient and so require little energy.   

       Essentially, that was [FlyingToaster]'s suggestion under Self Pumping Snorkel. I've not included this in the main idea, as it puts just as much complexity back in!
spidermother, Apr 10 2011
  

       complexity added in (posted).   

       sp. Subaquahullaballoon.
FlyingToaster, Apr 10 2011
  

       Perfect. That was your idea, after all.
spidermother, Apr 10 2011
  

       Mine's a Hullaballoon in form rather than function. In order to combine the two into your idea, you'd be limiting yourself to a depth where the balloons actually breach the surface.
FlyingToaster, Apr 10 2011
  

       Quite. Hence they are separate but complementary ideas.
spidermother, Apr 10 2011
  
      
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