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In 35 days, nine hours, and nine minutes, they rowed their 28ft-long, £50,000 lightweight R45 Rannoch rowing boat across 3,000 miles of shark-infested waters, waves reaching heights of 40ft, heavy storms, and busy shipping lanes.
Completing 1.5million strokes by keeping to a strict schedule of rowing for two hours and sleeping for one, the siblings overcame seasickness, and blisters and sores.
At their lowest, the MacLeans battled dehydration and extreme fatigue in 40-degree heat, burning 12,000 calories a day and losing around 20% of their body weight.