Theme park fan forums have been buzzing with rumors for months, but now our friends at Parkscope have found definitive proof: a brand-new Universal Orlando water park is on its way.

Stormwater construction permit filings with Orange County reveal that “Project 533” — which insiders shared months ago as the code-name for Universal Orlando’s new water park — will be built on an empty parcel just south of the new Cabana Bay Beach Resort hotel.

No definitive information is currently available about what elements will be included in the new attraction, though leaks and rumors point to a massive themed volcano, and a possible name of “WonderSea.” There’s also no indication yet of what might become of the Universal-owned Wet ‘n Wild water park once the new park is complete. The construction permits expire in 5 years, but given Universal’s rapid recent expansion pace, I’d expect to see the new park operating before then.