Recent rains in the Texas Hill Country could help recharge the cavern’s hidden aquifer, according to a May 1 Instagram post by the outdoor attraction. But even with more rain in the forecast, there’s no guarantee the fleeting natural phenomenon will return anytime soon.

“Honest talk: We don’t know if we’ll have another Aquifer tour anytime soon, even if it does keep raining,” the social post reads. “It didn’t last long. It never does.”

The family-owned attraction first reopened the tours after heavy rain swept through the San Antonio area on April 22, particularly in Comal County, where the caverns are located. The downpour revealed a “hidden aquifer” that hadn’t been visible in a decade due to ongoing drought conditions.

Photos and videos shared by the caverns show water from the Trinity Aquifer flowing through the cave system — a rare sight inside the seventh-longest cave in Texas. A specially built trail allowed visitors to get an up-close look at the million-year-old formation.

The experience didn’t last long. Within days, the water receded, ending what the caverns called a “rare opportunity to see a spectacular and unique natural phenomenon.” Before this spring, the last time the tours were offered was 10 years ago.

Now, with another round of storms possible this week, there’s a slim chance the aquifer could reappear.

The aquifer tour, which the cave’s website called a “rare opportunity to see a spectacular and unique natural phenomenon,” only lasted for a few days. But after unexpected power outages hit the area last Friday, and another cold front is expected to bring storms back to Texas this week, maybe the once-in-ten-year tour will be back sooner than expected. 

According to the National Weather Service, a cold front is expected to bring slightly cooler temperatures to San Antonio and Austin later this week, with highs dropping into the 80s. Rain chances remain low at around 20% on Wednesday and Thursday.

“Maybe it’ll come back with all this rain, or not. Either way we’ll be talking about it for years,” the Caverns said in its post.  

Natural Bridge Caverns has not yet responded to a request for comment.