Record high summer temperatures disrupt the seafloor, causing miners to find new strategies. Shawn fights a legal battle while Ken tries to keep his gold crown. Emily looks to expand her operation and the Kellys are forced to bail out at Fort Davis.
Kris and Emily each try out greenhorn divers to boost their productivity, but the plan grinds to a halt for one of them. As the miners look to find more valuable ground, Shawn must fight the sea's shifting tide and a new diver saves Vernon's day.
Tensions fly as Brad leads The Reaper into hostile waters where Emily defends Claim 14 from claim jumpers. Shawn hunts an elusive pay-streak. Vernon loses patience with his crew's performance. Ken tests a new operator to keep running around the clock.