I was recently aboard a military training facility that is used for a variety of training techniques, like close-quarters battle (CQB) and explosive breaching. On one of the breaching lanes I saw something interesting: a puck lock breached with high explosives. Puck locks do not have a visible hasp. They are one of the most mechanically secure padlock designs available. Since everyone loves explosives, I thought this would be an interesting pictorial post: puck locks vs high explosives.