Jet-Yank strip
Umbra's air strip (and the carrier-deck simulator next to it) runs the fortress's loudest drill: a jet or catapult sled on a main cable, cable branched to a row of padded ball-yokes. Slack first. Spool. The line goes bar-straight for a handful of seconds. Then a calibrated break—the cable is meant to snap, not the men.
Medics on the shoulder of the strip. Aftercare is mandatory thick balm and an ice bucket. Hospital is optional and usually full after demo days.
Two line classes
Civilian row: about 20 men share the total pull. Tourists hear the brochure call it an endurance chorus.
Pro row: certified Jet-Yank Pro—only 4 men. Roughly five times the share each. Pay is high. License can be pulled. Academy subjects who solo the four-man load for teaching (see Wade at the Municipal Academy) are the walking advertisement for this list.
Sequence (demo list)
1. Line up, padded yokes seated. 2. Cable slack. 3. Spool / takeoff surge. 4. Full tension—counted seconds. 5. Designed snap. 6. Medics in. 7. Balm and ice before anyone walks.
House line: civilians twenty to a jet's worth. Pro four—each man carries five shares. What breaks is the cable, not the roster.
Visitor
Rail is free with Umbra badge on posted hours. Grandstand costs Dick Coin. You do not get a yoke. You get the sound when twenty throats answer the snap.