They'll make a Cryptocoin called SploogeBux which will grant opportunities to buy futures in a to-be-constructed hydropower plant, then spin out sixteen kinds of derivatives around the fluctuations in the Coin's trading price. They'll implement a comprehensive social media strategy to market SploogeBux, targeting potential buyers experiencing maximum rainfall. And then they'll spin out a sub-company called SubCompany that guarantees access to yet-unproduced underwater living facilities you can rent-to-own in advance, contingent on the price of steel remaining cough above water into the next forty fiscal cycles.

Then they'll fight one another in a race to embezzle the assets, before retreating to a fortified compound in the Himalayas, where they can churn out a series of books titled "How To Survive The Coming Apocalypse Without Even Trying". These books will be traded by a series of bot farms hosted in a water-tight chamber at the last surviving Amazon Warehouse, and will be worth $70T/ea when the last of the Ultra-Rationalists is cannibalized by an erratic robot butler.