...I don't know what the attitudes were back in the late 50's on solo but I'm willing to bet it wasn't as accepting as it is today. Anyone know for sure?
I don't know about the 50's. I'm sure the attitude about many things (even today) will vary with the various regions within a country. How things may be perceived in the deep south may be different than the NE, or west coast.
In the mid 60's in Canada, solo diving was looked upon negatively by recreational divers. By the 70's even military and commercial divers worked in teams.