Thirty years after the first person rowed solo across the Tasman Sea in 1977, Crossing the Ditch was the effort of Justin Jones and James Castrission, known as Cas and Jonesy, to become the first to cross the sea and travel from Australia to New Zealand by sea kayak. Setting off from Forster, New South Wales on 13 November 2007 in their custom-designed kayak Lot 41, the two-man expedition succeeded after previous attempts, including the fatal journey of Andrew McAuley, had been unsuccessful. They arrived at Ngamotu Beach, in New Plymouth, New Zealand on 13 January 2008.

The Tasman Sea is a marginal sea of the South Pacific Ocean, situated between Australia and New Zealand. It measures about 2,000 km (1,200 mi) across and about 2,800 km (1,700 mi) from north to south. The sea was named after the Dutch explorer Abel Janszoon Tasman, who in 1642 was the first known person to cross it. British explorer Lieutenant James Cook later extensively navigated the Tasman Sea in the 1770s during his three voyages of exploration.