"aYes, Asturias; but these babies are quantum. Not your usual atoms floating about"
which presumably will justify a VAST price
Problem isn't the atoms - it's the effects you're trying to measure
gravity is Gravity and the differences are miniscule - the "noise" - position, acceleration (s), height are serious issues - and of course the difference in the gravity field from 10,000 tons of SSBN cp 10,000 tons of seawater measured over a kilometre or so away is vanishingly small
But hey , ho - there will be lots of BIG contracts and a lot of science done - just don't expect it to work very well......... or very soon.........