While I believe that this does indeed work, I seriously doubt one could pull it off in a real survival situation. Nevertheless, its still cool.
“The clear air and strong sun of late winter, plus the freezing winter temperatures, give you the best opportunity of the year to pull off the “fire from ice” trick in a real-world scenario. Whether you have seen it in books, or watched it on television, there’s still something incredulous about a lens of ice starting a fire. It just seems so unnatural. And I guess the real question you’re asking is, “does this really work?”
I’m a little surprised by the answer, myself, which is yes, you really can get fire from ice.”