At Weeki Wachee Springs State Park on Florida's Gulf Coast, women have been performing underwater ballet in a natural spring since 1947. It sounds like a kitschy retro roadside stop — and it is — but the job is closer to an endurance sport than a costume gig.

The spring itself is the star: a first-magnitude spring discharging around 117 million gallons of crystal-clear water daily toward the Gulf. Performers glide 20 feet down in a 400-seat submerged theater, breathing through an unregulated air hose adapted from Navy frogman training by park founder Newton Perry, a WWII veteran. No weights, no scuba gear — they control buoyancy with lung capacity alone, tucking their legs into fabric tails fitted with custom monofins that turn the whole body into one propeller. All while compensating for a current strong enough to push millions of gallons a day.

The bar for earning a tail is steep. hopefuls swim 400 yards nonstop, tread water, then dance ballet with a smile. Trainees earn scuba certification, master the air hose, memorize every role and music cue across every show, and can spend six months to a year before their first performance. Full mermaid status typically takes two to four years, capped by the mermaid test: breathing underwater for 40-plus minutes without surfacing, plus synchronized choreography held at a stationary depth. Around 40 to 50 people audition whenever spots open, and men can try out too — for the role of Prince. Social media has given the tradition a second life with younger fans worldwide.

The park also honors its past through the Legendary Sirens, veterans who still perform and teach. Among them is Rita King, now in her 80s, who joined in 1963 and returned in 2015 to pass on the skills. As she puts it, this isn't a weekend hobby — it's a way of life.

Travellers don't have to audition to join in. The park runs mermaid camps where visitors get fitted into a tail, painted with scales, and coached in the basics — the mermaid crawl, half-breath hovering, and the humbling art of staying down. Even a few minutes in a 72-degree spring, legs locked in a monofin, gives you real respect for the women who make it look effortless. Beyond the theater, the same spring feeds one of Florida's best freshwater ecosystems: kayakers drift downstream and manatees pass through. Few attractions anywhere blend live performance, natural wonder and 75-plus years of history quite like this one.