The Terrifying art of Free Solo Slacklining UNTETHERED - Full Documentary

Overview

The documentary follows a group of slackliners and highliners in Squamish, focusing on the preparation and execution of long, dangerous slackline “free solo” attempts. A central focus is a major project on the Chief, aiming for Canada’s longest highline, and, for Spencer, a world-record free solo.

Opening Theme: Fear vs. Fascination

The film begins with athletes explaining why slacklining/highlining feels compelling rather than frightening—contrasting their mindset with how most people react to the idea of a “piece of air.”

The sport is portrayed as mentally driven, with participants choosing commitment over fear.

Spencer’s Routine and Commitment

Spencer shares his week-to-week routine and mindset:

• During the week, he pours concrete
• On weekends, he travels to slackline/highline sites
• He lives in a van to fund gear and maximize time on the lines

Building Toward the Highline Goal

The group travels and builds toward their Chief project, including extensive rigging work. Key figures introduced include:

• Frey (Friedrik Kuna) — an expert from Bavaria, Germany, invited as a mentor
• Michael — described as highly energetic and a major source of “stoke”
• Spencer — portrayed as central to the Canadian slackline community

They progressively rig increasingly large lines, discussing the responsibility and workload once anchors are bolted—especially the work required to set new anchors and tension the line.

The 133-Meter Highline Moment

The team completes rigging of a 133-meter highline on the Chief. The atmosphere intensifies as they transition from setup to the final moments just before stepping onto the line.

Free Solo: Control and Immediate Response

Spencer emphasizes the difference between walking with a leash/harness versus free solo:

• He describes free solo catching as being “in control”
• When unroped, he remains more committed to staying balanced
• If he falls, he focuses on immediately securing himself

Breakthrough and No Leash Fall

After earlier setbacks—including a failed attempt where he stepped out and fell while trying to walk solo—Spencer ultimately crosses the 133 m line without taking a leash fall. The moment is framed as:

• His longest line walked
• A reinforcement of his focus on pushing farther

Community Celebration and Shared Culture

After the crossing, the film shifts into performances and celebrations, showing how the community rallies around these attempts—turning high-fives into hugs and drawing people together to share the moment.

Psychology and Motivation Beyond Money

Later sections broaden to the sport’s culture and mindset:

• Motivation isn’t only money
• Often it comes from friendship, unplanned moments, and community shared passion
• The documentary also acknowledges that outsiders may judge or fear the risk

Closing: Training, Mentorship, and Another Success

The documentary ends with continued training and mentorship details, including securing techniques such as figure-eight follow-through. It finishes with an energetic final sequence celebrating another athlete’s successful attempt:

“Levi just killed it.”

Presenters / Sources Mentioned

• Quintilian (referenced for descriptive writing advice)
• Spencer (featured slackliner/highliner)
• Friedrik Kuna (“Frey”) (mentor; from Bavaria, Germany)
• Michael (featured slackliner/highliner)
• Andy Lewis (credited in the narration as the prior world-record holder for free solo)