I downloaded all episodes of Men Into Space many years ago and burned them to discs.
I remember the ep with McCauley adrift repeating his name so they could track his trajectory.
An interesting tid bit, the spacesuit he wore in that ep was an actual spacesuit made by the US Navy for extreme high altitude flights, most likely by balloon at that time. Some of those balloon flights got very near the edge of the atmosphere.
Later eps used a simpler costume grade space suit, little more than a coverall with a realistic helmet and neck ring seal.
This was a great series, ahead of its time in some ways but dead on its time frame in other ways.