I believe that AC is way more dangerous than DC, and particulary the low frequency (50-60 Hz) that are used on normal mains, once upon a time lighting in tunnels (during excavation) was through a frequency converter that elevated frequency (i.e. essentially making AC more similar to DC):
A DC shock may stop the heart (which once the contact is broken is easier to restart) whilst AC males it fibrillate, and there is the "tetanic" reaction induced by AC that in many case might make the contact last longer or be impossible to break.
The old, basic rule is - in case of doubt if a wire is live - to touch it first with the back of a finger, and never with a fingertip, as the reaction to the shock would be to close the finger/hand around the wire in a very tight grip.
Much less than that, depending on length of exposure. The AC death graph (probably not applicable to this DC scenario, but illustrative nonetheless):
https://upload.wikimedia.org/wikipedia/commons/7/7f/IEC_TS_6...
Red is fibrillation with increasing probability of occurrence. Yellow is injury, green is harmless, and blue is imperceptible.