But he could not confirm if all five would come out today.
Looming rain was one of the main enemies of the operation, threatening to flood the cave complex in mountainous northern Thailand, although a bewildering array of other dangers could also doom the escape plans.
"We're going to keep people on site until they get everyone out, the boys, the coach and the divers", Decker said.
The story of the "Wild Boars" soccer team has gripped Thai and global media.
On June 23, a group of 12 boys from a local football team in Northern Thailand went missing along with their 25-year-old coach, when they set out to explore a local cave. Divers guided them though more than two miles of dark and narrow tunnels filled with murky water and strong currents.
A source inside the Chiang Rai Prachanukroh hospital where the first four boys are being kept said their condition was "not bad" but doctors were watching for signs of emerging conditions such as hypothermia.
The saga has dominated global headlines, with the team spending nine days unaccounted for inside the cave before British divers found the emaciated and dishevelled group huddling on a muddy bank.
Four more young footballers and their coach at the Mu Pa (WIld Boar) Academy Mae Sai, Ekkapol Chantawong, are still on the ledge.
Expert climbers, divers and Thai Navy Seals have mulled contingencies ranging from drilling an escape route through the mountain to waiting out the monsoon inside the cave.
A massive global search operation was launched and it took 10 days to locate the boys, who had taken shelter on a dry slope deep in the complex.
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On Sunday, officials decided they could no longer wait, saying conditions were "as flawless as they will be" for a rescue attempt. Two divers were assigned to each child to help them navigate the risky, narrow passageways.
On Sunday, officials waited until several hours after the rescued boys had been transported to hospitals to announce their rescue. Sunday's mission involved 13 foreign divers and five Thai navy SEALs.
On Friday, the death of a former Thai navy SEAL underscored the risks.
Four others were extracted Sunday.
Officials suspended the rescue operation on Monday, after pulling an eighth boy from the cave, leaving four boys and their coach still inside.
"The medical team is considering whether to let closest relative visit them", Osotthanakorn said.
Perhaps those prayers were answered, as hours after the last team members were rescued, the heavens opened and the monsoonal rains thundered down. There was no word on the condition of the fifth boy brought out earlier on Monday.
Four of the boys were rescued on Sunday, and authorities are now working to replenish air tanks along the cave's treacherous exit route.
The rescue mission is expected to resume Tuesday morning local time to bring out the remainder of the team.
One boy asked for a fried chicken dinner. Narongsak said experts told him the new rain could shrink the unflooded space where the boys are sheltering to 108 square feet. The boys and their coach have been stranded about four kilometers inside the cave.
A hint of setting sun and blue skies broke through the heavy clouds behind the caves as a helicopter whirred through the sky, carrying the last boys recovered to a hospital in nearby Chiang Rai. "The water level is still at a satisfactory level and we have enough teams to complete the mission", Narongsak said on Monday.