Much has been written about the so-called Franklin expedition (1845–), but not about the master mariners, who joined as “Greenland pilots,” as experienced whaling masters on Royal Navy expeditions were usually called in the 19th century. Having been on Royal Navy expeditions to the Arctic before, Thomas Blanky, the ice master of HMS Terror, was mentioned here and there in contemporary sources. But who he was and how and why he joined the expedition are still widely unanswered questions, to be dealt with for the first time here.