If you're caught you will get sent to D-Block solitary, a tiny cube where days are marked by a light shaft travelling across the wall - or you might be interrogated using techniques only alluded to in the otherwise thorough Alcatraz audio tour, with first-hand accounts by prison guards and prisoners of the Rock.

BBC: A tour of San Francisco��s Alcatraz

Pic Mail uses advanced video compression techniques to compress the file without loss of video quality or audio.

CNN: Top 10 video tools

The players' improved audio and video performance is also attributed to Pioneer's unique construction techniques that have been honed for more than 30 years in the optical disc manufacturing business.

ENGADGET: Pioneer intros BDP-120 / BDP-320 / Elite BDP-23FD Blu-ray players

Owen and another audio expert, Ed Primeau, analyzed the recording for the Sentinel using different techniques, and they said they don't believe it is Zimmerman who is heard yelling in the background of one 911 call.

CNN: STORY HIGHLIGHTS