The BMP-1 is a Soviet amphibious tracked infantry fighting vehicle. BMP stands for Boyevaya Mashina Pekhoty 1 (Russian: Боевая Машина Пехоты 1; БМП-1), meaning “infantry fighting vehicle”. The BMP-1 was the first mass-produced infantry fighting vehicle (IFV) of USSR. (Source: https://en.wikipedia.org/wiki/BMP-1) Video includes shots of Polish soldiers entering the vehicles, shots of IFV’s interior, aerial footage of IFVs’ crossing a filed and in trench.