Dartmouth college swimmer Tate Ramsden died on Monday while swimming laps in a YMCA pool in Florida, according to reports.

The 21-year-old Nashville, Tennessee native was trying to finish four underwater laps without coming up for air, sending his body into distress, the Associated Press reports.

“Tate had been swimming laps in the pool for some time and I was told he had swam approximately 4,000 yards before practicing his underwater swimming techniques,” Officer Douglas Stidham wrote in a report obtained by the AP. “It is believed he was likely attempting to complete a ‘100’ which is four laps across the pool without surfacing for air.”

Tate Ramsden swam for years at the Nashville Aquatic Club https://t.co/MNIqYgLDAb pic.twitter.com/PT4FEtfVuS — WKRN (@WKRN) December 28, 2015

According to AP, Ramsden was at the Sarasota YMCA pool with his uncle, sister and cousin, who alerted lifeguards after noticing that Ramsden had stopped moving underwater.

The lifeguards reportedly took him out of the pool, but he was later pronounced dead at the center when emergency personnel failed to revive him. In the police report, explaining the incident, the revival attempts are detailed, saying that water and blood came from the swimmer’s nose. A pending autopsy will reveal the cause of death.

According to FOX 13 in Tampa Bay, Florida, the college athlete was set to graduate next year and was a stand out student. He was a member of the Cum Laude society, a Merit Scholar and an All American, hoping to find a career in finance.

Dartmouth president Phil Hanlon addressed the university community in a prepared statement, FOX 13 reports.

“We have been in touch with Tate’s family to share our deepest sympathies with them at this time of heartbreaking loss,” he said.