When the French explorer Robert de La Salle’s 45-ton barque the Griffon disappeared in Lake Michigan with all hands in 1679, it ignited a mystery that explorers are still trying to solve some 350 years later. Shipwreck hunter Valerie van Heest has been at the forefront of the ongoing search for the Griffon, having filmed an episode of Expedition Unknown with Josh Gates for the Discovery Channel.
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