His announcement, at a news conference more than an hour after helicopters and ambulances were seen rushing from the cave area, drew cheers and applause.
And although the four had been rescued, there were concerns they may have contracted an illness while in the cave, Narongsak said on Monday.
Xylem, which has a market capitalization of about US$12 billion, has previously helped in rescue operations after mine collapses in Pennsylvania and Chile.
A spokesman for Musk's Boring Co. tunneling unit, which has four engineers at the cave, has said Thai officials requested the device, which could potentially help the children through narrow, flooded cave passageways.
Four boys among the group of 13 trapped in a flooded Thai cave for more than a fortnight were rescued on July 8 after surviving a treacherous escape, raising hopes elite divers would also save the others soon. The message, like most posted by the SEALs, ended with the fighting cheer adopted from the U.S. Navy: Hooyah.
They were the second batch to undertake the perilous journey out of Tham Luang cave in Mae Sai district in Chiang Rai, after the first, weakest four left on Sunday in a similarly successful extraction.
Four boys and the coach remain trapped in the cave.
"This morning they said they were hungry and wanted to eat khao pad grapao", Narongsak said referring to a Thai dish of meat fried with chilli and basil and served over rice.
All were taken to a hospital.
"The medical team is considering whether to let closest relative visit them", Osotthanakorn said.
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The mission to rescue a group of boys and their soccer coach trapped in the flooded cave since June 23 resumed hours earlier on Monday.
The four boys pulled from the cave Sunday were happy and in good health, authorities said.
The outlet reported that eight boys remain inside the cave.
Monday's mission involved 18 divers from Thailand and overseas.
"We've been working continuously overnight", a Chiang Rai government source told AFP on Monday morning, requesting anonymity, and confirming that there had only been a pause of the actual extraction operations.
"The divers that were assembled from many countries are proud to have conducted this operation until its success", Narongsak said.
After the boys did not return home from football training their parents went out looking for them and their bicycles and kit were found at the entrance to the cave.
Authorities had said that incoming monsoon rains that could send water levels in the cave rising, coupled with falling oxygen levels in the enclosed space, added to the urgency of getting those trapped out. Highlighting the extreme dangers, a former Thai Navy SEAL died Friday while replenishing the oxygen canisters laid along the route.
The daring and unsafe bid to rescue the boys - aged between 11 and 16 - was suspended by the mission chief late on Sunday to replenish oxygen supplies and make new preparations, which he said would take at least 10 hours. One was that it was unknown how safe and dry the area where they had taken shelter would stay as Thailand's rainy season, which lasts until at least late October, picks up pace.
The other, and perhaps more worrying, was that oxygen levels in the complex were falling close to risky levels.