Mask for snorkeling with periscope

The customer was given an interesting task: to design a snorkeling mask with a built-in periscope and the possibility of connecting the breathing balloon under the water. In the design, it was necessary to seriously pay attention to the distribution of air flows inside the mask to exclude the saturation of both the glass mask and the mirrors of the optical part. In addition, a "fast" belt was developed for the emergency removal of the mask.