They claim it has 140 cubic meters of rock shielding the device. But if it's in the damn itself, the the shielding is highly inconstant, and mostly concrete and water on one side. The equipment would also be surrounded by ambient noises and vibrations by the operations of the damn. Not a very controlled environment in comparison to an abandoned mine shaft or train tunnel.
Their explanation for shielding makes no sense.
They claim it has 140 cubic meters of rock shielding the device. But if it's in the damn itself, the the shielding is highly inconstant, and mostly concrete and water on one side. The equipment would also be surrounded by ambient noises and vibrations by the operations of the damn. Not a very controlled environment in comparison to an abandoned mine shaft or train tunnel.