How does Eichar make his argument for infrasound and the Kármán vortex street sound compelling and reasonable? What rhetorical strategies does he use to convince readers?

Read or watch another book or documentary that seeks to explain what happened in the Dyatlov Pass incident. Compare and contrast the two texts. What details does each stress or dismiss? Why?

Why is Eichar so interested in the Dyatlov Pass mystery, given that he has no personal connection to it? Does his book offer indirect answers about why he went to so much effort to try and solve this mystery?