Gabe Newell

Gabe Newell has splashed out $70.8 million on a Florida super mansion that comes with its own tunnel to the sea. The billionaire Valve boss acquired the roughly 20,000-square-foot home in Manalapan, Florida, the Wall Street Journal reported. Newell bought it from Cindy and Ron McMackin, founders of the mechanical subcontracting company Pan-Pacific Mechanical, who paid $39 million for it in…