Genuine question here, but why not use dogs for this? Is it because dogs might be too heavy and trigger a mine? What is the activation weight of a landmine?
How much energy could possibly be stored in one of those containers? Enough to drive a car 100km? (talk about range anxiety...)
I ask because I know that Hydrogen has terrible energy density per unit of volume, even at scary high levels of pressure (Google says 5.6 MJ/L for compressed hydrogen gas at 700 bar pressure). Compare that with gasoline which is 32 MJ/L (To be clear, I'm not advocating for gasoline as storage medium of energy, just showing the contrast).