 To survive and prosper, the player character can engage in various mining or salvage operations, recovering enormous bottle caps, cigarette butts, thorium crystals, and pearls, all of which are valuable commodities sellable in cities.However, both mutant fish and pirate subs lie in wait.Once the player has built up enough cash, they can begin to exploit a form of 'stock market' in which various commodities can be purchased and resold at other locations or times for higher prices.