We have been told that this divers gear was used by the soviet army as emergency equipment in their tanks from the mid 60ies to the late 80ies. Barbara tried it out but was not lucky with it...

This is the same clip (just lower resulution) as this:

https://www.clips4sale.com/studio/106732/18689603/175-barbara-and-the-old-soviet-army-divers-gear