The lecture starts at 00:52 mark. What is ‘Deathless’ or ‘Unconditioned’? That is the most difficult thing to understand from our conditioned human-perception/mind. This talk was given by Ajahn Sumedho who is the epitome of hardcore meditator. As an American, he has practiced for decades in the Thai Forest tradition which is well known for its emphasis on the intense pursuit of meditation and the realization of Deathless/Unconditioned awareness. So what is Deathless/Unconditioned? This lecture/talk is what he has to say on the subject. Also, you can download his PDF books for free. If you are intrigued by this lecture, you might want to try his books as well.