Even a less than 1mm nick on an artery and you are fuuuuucked dawg. I've seen vids and pictures of way too many fatal arterial hits due to pure accident resulting from shop tools and fragments from fireworks that I am a safety freak at work regarding any pneumatic tools with air tanks. I purge and drain water from every compressor as soon as they are shut off and I make sure everybody I train do the same thing. Murphy's law is a real thing.
Speaking of artery cuts, did you see the vid of the robber who was armed with a sickle and attempted to slash the clerk or someone else in the store and he missed and accidentally slashed his own leg and cut into his femoral artery and bled out right there.