UPDATED: July 8, 2018 4:40PM

(CBSDFW.COM/CNN) – A former Thai Navy diver who joined the operation to rescue 12 boys and their coach from a cave in northern Thailand has died, according to a Thai Navy source.

The former SEAL, who was identified as Saman Kunan, died at 2:00 a.m. Friday due to a lack of air while attempting to return to a command center, located two kilometers (1.2 miles) inside the cave, where the young soccer team and their coach have been trapped for almost two weeks.

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Saman Kunan (Facebook via CNN)

A huge operation is underway at the Tham Luang Nang Non cave complex, where dozens of Thai Navy SEALs and international experts are attempting to find a way to get the boys out.

The members of the Wild Boar soccer team were reported missing on June 23 when they didn’t return from an outing after soccer practice. They entered the cave during fine weather but became trapped when when sudden downpour flooded the narrow tunnels.

The 12 boys and their coach were found deep inside the cave by two British cave divers on Monday, perched on a rock slab above flood waters, after nine days without food or fresh water.

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Since then, rescuers have been examining ways to bring the boys out, including fitting them with full-face oxygen masks and accompanying them on a long, dangerous swim through the tunnels.

However, the death of an experienced diver in the cave system underlines the inherent risks in attempting to move the boys, who are physically weak after days without food.

It takes even the most experienced divers up to five hours to swim through jagged, narrow channels from where the boys are to safety outside.

Speaking to CNN Wednesday, Cade Courtley, a former US Navy SEAL said bringing the children out through the flooded tunnels could be treacherous.

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(The-CNN-Wire™ & © 2018 Cable News Network, Inc., a Time Warner Company contributed to this report. All rights reserved.)