Cook Strait, strait separating the North and South islands of New Zealand, extending northwest to southeast from the Tasman Sea to the south Pacific Ocean. About 14 miles (23 km) wide at its narrowest point, it averages 420 feet (128 m) in depth.
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Cook straitIt's 26 kilometres of cold, rough water swimming against strong tidal flows and abundant marine life. Due to the underlying mountainous geography, the water can be extremely unpredictable with swirling eddies and upward currents. There are very few opportunities, in any given year, to attempt this swim.
It would be engineeringly impossible to build a bridge or tunnel between the North and South Islands of NZ using current engineering technology. Cook Strait is very deep and the several earthquake fault lines would preclude a tunnel.