Why on earth doesn't the top answer have more upvotes. Impressive research, with full background, alternative pictures and an original picture of the panzer falling into the river.
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See also ConeOfArc's video from a month later, https://www.youtube.com/watch?v=RO58B6LcTfM (1M views). The video above is about the initial search and problem, this video is after many Internet strangers worked together to solve it.