bottle. it has a removable pod. take the pod out. put this up. drink. and then put the pod back. and take it back. reporter: even the extreme free divers we met on the beach think this is crazy. i was blown away. i didn t think that was physically possible. reporter: allen loves the freedom and isolation of scuba diving and doesn t plan on losing any sleep over the world record attempt. actually, easier to sleep underwater than it is to sleep in the bed. really? yes, you are weightless. just drifting along. unbelievable. you know they say the last time when he did it, the last under water attempt, he had a computer monitor, keyboard, especially rigged so he could watch movies, listen to music, get on facebook. hardest part, not having human interaction or joke around. after that, you crave human contact. i don t know how you pulled it off for so long. i am from hawaii. just comes naturally. six weeks. we ll have more news from abc coming right up.