If you pump one cubic meter of air 100 meter deep, the energy stored equals a tonweight at 100 meter up. That is 9.81 kJ aka 2.7 Wh. This is inifinitely scalabl

If you pump one cubic meter of air 100 meter deep, the energy stored equals a tonweight at 100 meter up. That is 9.81 kJ aka 2.7 Wh. This is inifinitely scalable and suits flat places like Australia. One and only minor problem is how we prevent the 2.7 GWh energy storage, which is 1E9 m^3 aka one cubic kilometer inflatable container, not rupturing or raising up. But otherwise ingenious nicht wahr?