The original rigid airships had a series of bladders containing the lifting gas. These bladders were effectively open bottomed. As the air pressure dropped they simply let the lifting gas vent out of the bottom of the bladder. I thought this was pretty crazy when I read about it, and it did lead to a nasty loss of an early airship. The windscreen of the open top cockpit/gondola created a vortex that trapped the venting hydrogen. This eventually led to a fire/explosion and loss of the airship. Although not as crazy as the really early dirigibles before they mastered mass production of hydrogen. They used coal seam gas as the lifting gas, and even ran the engines from a feed from the balloon.
I would imagine to preserve the helium the Airlander 10 could use a compressor to store the helium in tanks and reduce the internal bladder pressure.
I wonder if there is a limitation to how much power you can make from that size of linear generator/stator though, so you wouldn't get much advantage, I don't know that much about that side of things though.
Mars has the problem of so little atmosphere that aero braking barely slows you down to a speed where you can open a parachute and not have it ripped apart as you are still travelling at supersonic speeds. And the atmosphere is just thick enough to upset rocket engines firing into the oncoming stream/airflow so you can't do a powered descent.
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