GIANT jellyfish glowing eerily purple and trailing massive tentacles are proving to be an unexpected challenge for a father and his pals facing a unique English Channel swim early next month.

BRITISH adventurer Lewis Gordon Pugh began his journey to the Arctic yesterday to raise awareness of the “devastating effects” of climate change by swimming in the coldest waters ahuman has endured.

A father-and-son swimming pair made it almost all the way across the Channel but ended the effort a few miles short of the coastline of France.