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.
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.