Also known as aquastats or hydrostations, the submersible cities of the Eurasian Alliance
The Rock of Gibraltar, once a stalwart of British power, the gate to the Mediterranean, now is a fortress for the Eurasian Alliance. It's fair teeming with neo-Soviets and submarines.
Like a Binding Oath Ring but it stops anyone under witness protection from revealing his or her true identity to anyone. I might make this into a submission one day.