clean

Does anyone here have this mask? I own one for a long time and realized some dirt under its skirts. Decided to unscrew the stainless steel bolts on its sides but couldn't separate the central part of the mask. Does anyone know how to completely disassembly?

Hi, we are a group of 9 mechanical engineering students from Sherbrooke University located in Canada. We are currently working on our final year project and have decided to look into underwater trash collecting. We think that plastic and thrash accumulation in our oceans is one of the biggest...