What this adds, what it agrees with, and where it falls short

What this adds

None of this is new primary evidence. Each item is a new analysis of evidence already in print: the 1959 file, public elevation, astronomical and launch data, the published model with its peer-review file, and the 2018 exhumation reports. A conclusion that the analysis supports, and that historians find plausible, does not validate the computation that reached it; the code and inputs are saved so that each computation can be checked on its own terms.

  1. A check of the average slope at every published candidate for the tent position from the public 30 m Copernicus elevation model: 15 to 16 degrees at the site, no candidate above 19.5. It bounds the average, which the 2021 paper put at 23 ± 2 degrees and the 2022 follow-up at about 20, and it says nothing about the 4-to-6 m steps the model rests on, which the authors' 9 cm drone survey shows.
  2. A from-scratch reimplementation of the Gaume–Puzrin release model with a sensitivity and regime map. The delayed release exists only between 24.7 and 29.7 degrees; the forensic window is met only at 26 to 28.5; cohesion of 300, 440 and 450 Pa gives failure at the cut, the published delay and no release; and the time to release is proportional to a deposition rate that nothing measured constrains. Dieter Issler's review called the agreement coincidental, and the regime map supports that judgement.
  3. Injury physics that makes the examiner's statements quantitative. Any 100 to 300 kg of hard snow at 1 to 2 m/s, or 3 to 4 m of static snow on a person against a firm base, gives the rib pattern without breaking skin, so the tent and the ravine cannot be told apart by the chest injuries. For the temporal fracture, the 2.5 to 10 kN of the cadaver tests over the 63 cm² of the depression needs a crushing pressure of 400 kPa or more, which excludes a soft or medium slab as the sole loader but not a hard one, nor a hard object under the snow.
  4. The fact-by-fact scoring of 28 documented facts against nine explanations, with the contradicting sheet named in each red cell, and the three slab versions kept separate because they put the injuries in different places.
  5. The darkness and the clock. The moon was below the horizon from 11:27 on 1 February to 04:15 on 2 February; full night from 19:40; the tent site in mountain shadow from 14:40. Walking times of 35 to 85 minutes to the cedar, wind chill on the slope of −22 to −29, and the Burmantovo readings falling from −8 to −21 °C between 15:00 and 03:00 give the reconstruction its times.
  6. The fireballs closed with the launch list. Buyanov and the space historian Aleksandr Zheleznyakov matched the 17 February sighting to an R-7 launch in 2007; the GCAT launch list confirms it to the minute, matches the 31 March sighting to the R-7 failure at 22:53 UTC on 30 March, and shows nothing capable of reaching the northern Urals on 1 or 2 February.
  7. A catalogue of 41 places where the standard English transcription differs from the Russian on load-bearing points, among them the "bomb" in Vozrozhdenny's testimony, which in Russian is «воздушной взрывной волне», an air blast wave, with no bomb; "in the first hour" for «в первые часы», the first hours, in Slobodin's act; and the knuckle abrasions rendered as the wrist. English-language discussion of the case rests on those translations.
  8. The legal status of the 2020 conclusions: disowned by the Prosecutor General on 10 August 2020, never published, never ruled on by any court, with the 28 May 1959 resolution still the only operative decision, and the relatives' 2 June 2026 demand for a new case unanswered at the date of this report.

What agrees with earlier work

The finding rests mainly on Ivanov's 1959 resolution that a natural force killed the group and on Vozrozhdenny's statements on mechanism and survival. Sogrin's 15 to 18 degrees and Borzenkov's 16 to 17 are what the elevation model gives. The location of the injuries in the ravine is Kuryakov's and Nikitin's. The 17 February R-7 identification is Buyanov's. The observation that small slabs on these slopes vanish within an hour is Puzrin and Gaume's own field result, and it is the reason the missing debris does not rule out every slab version. Issler's point about the fitted delay was made in peer review in 2020. The drone survey's finding that steps steeper than 28 degrees run above every candidate tent position is taken from Puzrin and Gaume's 2022 Comment and was not independently checked. Nikitin's 2018 reading of Zolotaryov's chest as compression by "a large heavy mass, most likely snow", and his 2019 placement of the injuries in the ravine, are taken as expert opinion consistent with the 1959 examiner rather than as new measurement.

Where this falls short