Kings Bay naval base, on the Georgia-Florida border, has been the U.S. Navy hub for nuclear ballistic missile submarines since the 1980s, says the team submission, with operations halted for the first time to enable an estimated $627M upgrade of its unique drydock and other infrastructure that was completed last year.

Two Israeli marine biologists have joined that country’s start-up craze, using $1 million in new investor cash to develop their innovative, environmentally friendly concrete for marine infrastructure and expand their company, ECOncrete Ltd., into the booming U.S. coastal-upgrade market.