That's the 2013 inbounds persistent slab avalanche at Arapahoe Basin. It caught 15 people, partially buried six, and fully buried one as they took guests back there for the first time of the year.
The longest ride was nearly 700 vertical feet. It's remarkable nobody died. It's very much worth reading the CAIC report:
https://avalanche.state.co.us/caic/acc/acc_report.php?acc_id=490&accfm=inv
A-basin bombed the crap out of that, and it still slid big. They are now using a compaction roller to break up the persistent slab.
http://arapahoebasin.blogspot.com/2018/01/compaction-roller-in-montezuma-bowl.html
http://arapahoebasin.blogspot.com/2016/09/new-device-compaction-roller.html
At each area I ski, I'd like to know which runs have been compaction rolled, which have been boot packed, and on which only explosives have been used. Or, no explosives at all as in Prima Cornice at Vail. And, why for extra credit.
That information would very much inform my choice to ski a run, especially for the first few days a run is open for the season when the risk of a persistent slab avalanche is greatest.
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