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Jacques Rougerie has been able to spec out a massive floating city capable of housing some 7000 “ocean scientists,” and yet still hold the strict tolerances of the manta form factor. That, he says, provides the “best possible correlation between space and stability needs.” Practically speaking, that translates into the ability to resist turbulence and severe weather. Rougerie’s City of Mériens would be 900 meters long and 500 wide, while extending to 120 below the surface, and rising to 60 above.