In 1996, NOAA scientists pumped 2 dyes beneath Key Largo to learn where groundwater went; 18 days later, 2 bay-side wells showed it flowed toward the Atlantic
In 2011, scientists injected yellow-green fluorescein dye into Maui’s wastewater wells; 84 days later, it appeared near the Pacific, supporting an underground wastewater connection
In 2017, scientists poured Rhodamine WT pink dye into Porter Hole Sink under Florida’s Lake Jackson; 35 days later instruments picked it up at Wakulla Spring through limestone caves
A university professor spent 100 days living in a 100-square-foot habitat 22 feet beneath a Key Largo lagoon — and when he finally surfaced, he measured half an inch shorter after spending the entire mission under elevated pressure