He Was Inside The Searched Area For Nineteen Hours. Two Teams Walked Past.
A hiker found alive on day four had lain 400 metres inside ground cleared twice. His watch logged altitude and steps throughout. Matched against the teams' GPS tracks, it puts searchers within 90 metres of him, twice.
Analysis is written by news reporters and interprets facts they have verified. It is not opinion, and it takes no position on what should be done.
PACKWOOD, Wash. — Wesley Tarn-Ochoa was found alive on the fourth day, 400 metres inside a drainage that three teams had cleared on day one and cleared again on day two.
He had not moved. His watch says so: a barometric altimeter and an accelerometer, logging continuously, recovered from an evidence bag and read out for this newspaper by a firm that was not told what it was.
Matched second by second against the incident commander's assignment log and eleven GPS tracks bought from Lewis County for $27, the watch puts a searcher 88 metres from him at hour 19, and 71 metres from him at hour 31.
Two numbers in this piece are both nineteen and they are not the same nineteen. Teams logged nineteen hours and twenty minutes of boots-on-the-ground time inside the segment that held him. Hour 19 is when the first of them came closest.
The hollow
He slipped at 09:12 on the first morning, took forty-one steps, and stopped. The watch records nothing at all for the next thirty-one hours.
He was in a rock hollow under a fallen hemlock, four metres below the line a walker takes on that bank, wet through, and hypothermic by the end of the first night.
At hour 31 the watch logs four steps. He says he heard voices and called out. Of the first pass, in the dark at four in the morning, he remembers nothing.
The arithmetic is already published
None of this is remarkable. It is the number the discipline prints in its own manuals and teaches to volunteers on their first weekend.
A hasty team clearing steep timber achieves a probability of detection of roughly 0.4 for a subject who is still, silent and lying down. Three passes at 0.4 leave better than one in five such subjects uncounted. Segment D-2 was signed off twice, the first time with 0.5 written by hand in the box.
Eleven cases, unlabelled
We took the eleven recoveries most often described as physically impossible, stripped every name, place, date and source from them, and gave them to two search statisticians who were not told whose list it was.
Both placed each case against the published distance-from-point-last-seen distributions, built from about 150,000 logged incidents and broken out by subject category: child, hiker, hunter, despondent, dementia.
Nine of the eleven fall inside the 95th percentile for their category. Several are dull. One much-cited hunter was recovered at 6.1 kilometres from his point last seen, where the 95th percentile for hunters is 9.6.
One is a transcription error. Case four turns on a recovery at 4,100 feet of elevation. The original incident report, which we obtained, gives 1,400. The digits were reversed somewhere between 1998 and the first book to carry it, and the figure has been reprinted eleven times since.
Roderick Cavanaugh-Pyle, who compiled the eleven, has told us he is withdrawing case four. His reply runs below in full and it is the best argument against this article that anybody made.
The discipline does this to itself in public, and better than its critics allow. Our vault holds PX-2173, in which a slab-avalanche model is calibrated against a set of 1959 autopsy findings and then tested by people who went back to the pass.
The one that does not fit
Case eleven is a man of seventy-four with dementia who walked out of a care home at about half past six in the morning and was found alive on the fourth day by a farmer, in a hay barn, 31 kilometres away, on the far side of a river with no crossing within 19 kilometres of either point, in indoor shoes.
Ninety-five per cent of subjects in his category are recovered within 3.2 kilometres. Both statisticians, working separately and blind, put him beyond the 99.9th percentile.
We could not get the recovery team's track. The county says the device was replaced in 2016 and the data never migrated. One of the two searchers who found him declined to speak to us; we could not locate the other. The incident report is internally consistent, which is all we can say for it.
He never said how he got there. He died in 2021.
We print it here, at the foot, unexplained, because leaving it out of a piece that has just explained ten other things would be a way of winning an argument rather than reporting one.
What this desk takes from it
The nineteen hours are the story and the 0.4 is the reason for them. A man lay four metres off a trail, inside ground that had been searched, signed for and released, and the searchers who walked past him were not careless. They were operating at the detection rate their own manual predicts, which is much lower than the word cleared sounds.
Mr Cavanaugh-Pyle's reply makes the point we did not: we have printed his cases as ordinary and filed the finding under a headline that makes the searchers the subject. He thinks the scandal is the word on the form. So, now, does this desk.
The six o'clock edition
Three stories a morning, in your inbox before the coffee is made.
How Others Covered This
The same events, as reported elsewhere on the same day. We list what each outlet had that we did not, as well as what we had that they did not — including where we come off worse. Why we print this.
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The Meridian TelegraphFOUR DAYS IN THE DRAINAGE: THE GROUND THAT GAVE HIM BACK
Took the double clearance as evidence that the drainage had been empty and then was not, and built the piece on the gap between the two.
Had that we did not
The assignment log, quoted accurately and at length, and a genuinely good account of the volunteer who broke his tasking and went back.
Left out
The detection-probability figure printed on the same form, three lines under the sentence they quoted, in a box the team had filled in by hand.
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ApertureThe Arithmetic Of Not Being Seen
An essay on hypothermia, silence and the failure of the will to shout. The best writing anybody has done on this incident.
Had that we did not
Tarn-Ochoa's own description of deciding not to call out, which is the most useful thing said by anyone about why searches miss people.
Left out
It never asks for the GPS tracks. They are public records in Washington, they cost this newspaper $27, and they contain the whole answer.
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They Buriedthis newspaperHe Was Inside The Searched Area For Nineteen Hours. Two Teams Walked Past.
Had a survivor's watch read out, put it on the same clock as eleven team tracks, and then tested eleven famous recoveries blind against the published distributions.
Had that we did not
The watch log entire, all eleven tracks, both statisticians' unblinded worksheets, and the case we cannot explain, printed unexplained.
Left out
We reconstructed a hypothermic man's night second by second and put his four steps in a diagram. That he is certain he shouted, and that his certainty is not evidence of a sound, sits in a footnote and not in the diagram. — V. Ashcombe-Doyle, standards editor
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