Sonar contacts that rise through the water and continue into the air, naval crews tracking objects they can't account...

Sonar contacts that rise through the water and continue into the air, naval crews tracking objects they can't account for, and ordinary people watching from the shore. Volume 2 of my history of unidentified submerged objects documents the cases from 1970 to 1989. Out now in hardcover, paperback, ebook, and audiobook: https://t.co/4ICM37D9Zg

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