C-Thru smoke diving helmet concept. It helps firefighters to see clearly in smoke-filled buildings to do rescue missions. Using their traditional firefighting equipment, they have to keep hand contact with walls or crawl on the ground while carrying heavy
Aside from tying shoes, a lot of people don't know, or need a refresher on tying knots. Knowing these knots will get you through most situations you will encounter, and they are the ones I use most often. The knots covered in this video are: Square.