"How do you negotiate with an iceberg? You go around it.

I'm about to swim where I shouldn't be able to, for the second time in my life. All because of ice – or the lack of it.

Thirteen years ago I swam across the North Pole. That swim shouldn't have been possible; the Pole should have been frozen over. But the evidence of a warming planet was there in the ink-black water, and I needed everyone to know about it.

This month I'll be swimming across the Ilulissat Icefjord, which is fed by the world's fastest moving glacier. Ilulissat calves massive icebergs (including, legend has it, the one that sank the Titanic) and helps scientists understand how quickly glaciers are retreating due to climate change."

OMK Lewis Pugh (1980), UN Ambassador to the Seas, is going to be embarking upon his longest, coldest swim yet: the world's first multi-day polar swim - to raise awareness of climate change and the rising sea levels and its implications for life on earth as we know it, in advance of the COP26 Conference in Glasgow

Follow his progress https://lewispughfoundation.org/news on FACEBOOK and TWITTER