Video captured the moment of Men blow out large glass jars from the calcined sand with their mouths in Thai Binh, Viet Nam.
Men work in a workshop that produces handmade glass. Their job is to make glass products from sand. They produce glass mainly by hand methods that have been around for a long time. To create glass products they use heated sand and blown steam to create glass vases.
The men who work here say they blow a lot of glass products out of sand every day. so their breath is very long and their lungs store a lot of air.
This is a traditional trade in their area. Glass products manufactured by modern machinery are threatening their work. They said they will try to maintain this job.