US explorer completes 1st-ever solo, unaided Antarctica trek

American explorer Colin O'Brady took 54 days to walk 1,500 kilometres across Antarctica, dragging a 170-kg sled, to become the first person to complete a solo, unaided trek of the continent. The 33-year-old said he completed the last stretch of the journey in one continuous 32-hour push. Earlier, a 55-year-old British explorer died while attempting similar trek in 2016.