The PTS is a Soviet tracked amphibious transport. PTS stands for Plavayushchij Transportyer - Sryednyj or medium amphibious transport vehicle. Its industrial index was Ob'yekt 65.
Introduced in 1965, it is large, with a substantial payload of 10 tons, two to four times the capacity of the BAV 485, and better cross-country performance, at the cost of somewhat higher purchase costs because it is tracked. The most common model is the improved PTS-M that is powered by a 350 hp diesel engine.
Wikipedia https://en.wikipedia.org/wiki/PTS_(vehicle)
Official Website https://www.youtube.com/watch?v=XqEDK1N-kx0
Coordinates 51°56'42.979" N 15°19'13.614" E