The Sentinel Series II caches are placed along a powerline right-of-way access road, between two forest industry yards, and not far from a local pub in South Slocan. Mount Sentinel is the big mountain to the Southwest.
This new series replaces the original Sentinel Series which was archived because the Bright Green caches was destroyed [details]. The new series is just like the old series but it's been reversed.
This is one of three stand-alone caches which also contain clues for determining the final coordinates of the fourth cache in the series.
Sentinel Series II - Not So Bright
You're looking for a small bright blue lock'n'lock container.