Crazy Ivans aren't found only in submarines

[Byker]

https://www.youtube.com/watch?v=qEcmdAn-iA0

https://www.youtube.com/watch?v=Yxs2dfRiuXk

Note how the cameraman squats down:
https://www.youtube.com/watch?v=xOpfBo7IrOs

They prang only occasionally...