1950s Home Movie- Underwater Ballet

Thanks to TV Days for this classic clip. A commentator noted:

This was filmed in my home town, San Marcos Texas at the headwaters of the San Marcos River. They established an amusement park there back in the late 40's and it operated up until the early 90's. Aquarena Springs. They had the underwater theatre, Ralph the Swimming Pig, and an incredible sky ride that took you over the river.