High Exposure is the first episode of the fifth season. It was released on 3 October 2008.
As well as altitude, their may be a film exposure image here.
Skeet (Theresa) mentions that a new climbing route "might even be as hard as a 5.14"; later, Pete says that it "might be the first 5.15 in California". These are references to the Yosemite Decimal System (YDS), one of several grading systems for the difficulty of climbing routes. The major numbers run from 1 (walkable) to 5. Originally, the scale was planned to run from 5.1 to 5.9, but the development of new techniques and disputes over relative difficulty led to expansion past 5.10 and the addition of a letter grade. In September, 2008, Chris Sharma completed a climb on Clark Mountain in California, which he called Jumbo Love. This route has a proposed YDS rating of 5.15b.
First appearance of Sophina Brown as Special Agent Nikki Betancourt. The actress previously guest-starred in season 2, episode 11 ("Scorched") as completely unrelated character Bianca Styles.
When the agents figure out that they should be looking for a crashed light aircraft, Eppes asks if the plane had a transponder. A transponder makes an aircraft's radar blip look sharper to a controller during flight, which would be useless after a crash. He should have asked about the ELT, Emergency Locator Transmitter, which is required equipment and would have activated automatically in the event of a crash.
[This appears on the beginning of the episode] 225 crashed aircraft 72 carats 32 geographic satellites 2 climbers