Boater Dan
Guest
Kershaw make a Knife for fire with a Diamond Punch on the Handle I used it at Deeper Depths it is A great tool No springs Just Smash the Glass little effort, But as D Said Some Glass q little Harder than others.
Diamond punch will work on tempered side glass but will not work on laminated side glass. If you are not familiar, laminated is the same that is utilized in the windshields of vehicles. This presents a big problem for submerged vehicles. I do vehicle rescue for the FD and we utilize a Sawz All or a Glas Master Saw on laminated glass. There is no easy answer that I am aware of on this scenario.
Dan