Legendary mountaineer Ueli Steck whose journey to climb all 82 peaks over 4,000 meters in the Alps — during a 62-day period in the summer — led him to some of the hardest mountains in the world.

His daring adventure may have garnered him international attention, but, as showcased in a new behind-the-scenes video of his record-setting quest, the search for mountain climbing glory isn’t always happy; it can be tragic.

In the third installment of a four-part video series profiling his historic feat, Steck is followed by EpicTV cameras as he finishes his traverse of all peaks above 4,000 meters in the Swiss Alps and crosses into France.

As he heads up into the Mont Blanc massif mountain range in France, Steck meets up with his friend, experienced Dutch mountain climber Martijn Seuren, to attempt to summit the Rochefortgrat peak.

Tragically, Seuren would never make it off the mountain range.

In a freak accident, the 32-year-old Seuren slipped while on a ridge on the peak, which borders Italy and France, and fatally fell 985 feet down the Italian side of the mountain.

Watch as Steck recounts the tragedy and his decision to briefly suspend his quest, out of respect for Seuren.

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