Eight boys are now out. The operation is finished for today.

The operation has begun to rescue 12 boys and their soccer coach who will need to dive out of the flooded Thai cave where they have been trapped for more than two weeks, with officials saying Sunday morning that “today is D-Day.”

Thai soldiers try to connect water pipes that will help bypass water from entering a cave where 12 boys and their soccer coach have been trapped since June 23, in Mae Sai, Chiang Rai province, in northern Thailand Saturday, July 7, 2018.

Chiang Rai acting Gov. Narongsak Osatanakorn said 13 foreign and five Thai divers were taking part in the rescue and two divers will accompany each boy as they are gradually extracted. The operation began at 10 a.m. and he said it would take at least 11 hours for the first person to be rescued.

The only way to bring them out of Tham Luang Nang Non in Chiang Rai province is by navigating dark and tight passageways filled with muddy water and strong currents, as well as oxygen-depleted air. A former Thai navy SEAL passed out making the dive Friday and died.

Experienced cave rescue experts consider an underwater escape a last resort, especially with people untrained in diving, as the boys are. The path out is considered especially complicated because of twists and turns in narrow flooded passages.

But the governor supervising the mission said earlier that mild weather and falling water levels over the last few days had created optimal conditions for an underwater evacuation that won’t last if it rains again.

Before announcing that the rescue was underway, authorities ordered the throngs of media that have gathered at the cave from around the world to leave.

The boys, ages 11-16, and their 25-year-old coach became stranded when they went exploring in the cave after a practice game June 23. Monsoon flooding cut off their escape and prevented rescuers from finding them for almost 10 days

(being updated)