Mask full flood and clear. This skill is necessary for a variety of reasons. Masks floods may happen accidentally or purposefully to clear a foggy mask. These students handle the skill calmly and do great at it. The only true emergency underwater is running out if air. Everything else is just an inconvenience. I am filming using a Go Pro on an OTS Guardian full facemask, with a rail mount.
![](https://i.ytimg.com/vi/WG7hM6OvzVc/maxresdefault.jpg)