4 ms·
> No. Once a TBM is below a certain depth (approximately two tunnel diameters – or 28 feet in this case), the tunneling process is almost impossible to detect,
by sathishmanohar 9y ago
> No. Once a TBM is below a certain depth (approximately two tunnel diameters – or 28 feet in this case), the tunneling process is almost impossible to detect, especially in soft soil.
They missed an important FAQ, Will this tech increase bank heists?