On the day of his disappearance, Henderson texted friends to indicate he was switching his phone to airplane mode as he began his hike, parking his vehicle in Torla, a nearby village. "We suspect he entered the park from Torla," shared his friend Max Senoff on social media. Henderson reportedly had just wrapped up a vacation that included attending the Running of the Bulls festival in Pamplona.

The challenging Mount Perdido trail, known for its steep climbs, does not require technical climbing skills, yet safety remains a primary concern during the search. Following his failure to board a flight back to Amsterdam, authorities initiated a search operation on July 14. Helicopters and specialized rescue teams from the Guardia Civil have been deployed in the Huesca province.

Henderson's parked car was located at a popular trailhead, and a receipt for camping gear has raised concerns that he may have ventured deeper into the wilderness. Known for his passion for travel and the outdoors, Henderson is highlighted by friends as an enthusiastic group planner and an active member of various social clubs back in the Netherlands. His friends hope for a swift and safe resolution to his disappearance as search efforts continue in the picturesque and perilous landscapes of the Ordesa y Monte Perdido National Park.