When watching Hollywoods finest rescuing sailors from submarines, the heli crew always drop an 'earth' wire to the sub first. Apparently this is to ensure that the sub and heli are both at the same electrical potential before lowering a crewman. It seems that if this is not done the crewman completes a circuit and gets frazzled.
Is this just Hollywood making the movie interesting? Or do both the heli and sub have to be earthed together before a crewman can be lowered?
May I also add "Well Done" to those SAR crews involved in the HMCS Chicoutimi rescue.
CC