It recommended that search protocol for missing persons in backcountry thermal terrain include systematic offtrail coverage of secondary vent areas using ground penetrating radar and thermal imaging rather than relying on trail centered search grids.
And it recommended the installation of marker posts at the boundaries of the newly designated hazard zones.
Posts bearing a simple aluminum plate with a symbol, a circle divided by a diagonal line, the universal marker for do not enter, and a brief text explanation of the hazard below.
The first of these posts was installed on the morning of October 15th, 2026 by a crew of three NPS maintenance workers at the edge of the riolyte zone above the drainage channel where Daniel Voss had died.
The post was made of treated steel and embedded 2 ft into the rock substrate with concrete.
[music] It was unremarkable to look at. Three hikers passed it that same afternoon on the ridge trail above, reading the aluminum plate and moving on.
