I have been told it doesn't widen by much. This is a tube entry point and not a swimming area. The swimming area is closer to the parking lot. The spring fed swimming area is beautiful. There is a deep area for snorkeling and shallow areas for small children.
Blue hole is another area to swim.
However, it is approximately a half-mile walk, but well worth it. Cave divers frequent this spring. There is not an area for the young or non-swimmers. Trams are available during the tubing season.