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As for other essentials, humans need food and water to survive anywhere. The team reportedly had very little food before the rescue teams arrived. However, "a human being in good health can survive weeks, or even months, without any food," Rinaldi said. That's just as well, because there is "no food for humans in a cave," he said. Though many caves are filled with bats, and sometimes birds and fish, the animals are all "extremely difficult to capture," he said. As for water, that's a more "delicate matter," Rinaldi said. In caves, there's usually high air humidity, which reduces the tendency to drink, Rinaldi said. But humans still "absolutely need it" every day. In the Thailand cave, the "water would probably be muddy," he added. So, if stranded people don't have a device to-filter the water, it would be "much cleaner and safer" to sip the water that drips from the cave's ceilings and walls, he said. (Now, the rescue teams are providing food and water to the Thai soccer team.) Temperature could also be an issue in caves, but not in this instance, Rinaldi said. "Hypothermia is another dangerous foe, but (in) this particular case we are dealing with a tropical cave, so temperature should well be above" 20 degrees Celsius (68 degrees Fahrenheit), he said. In addition to the physical challenges of being trapped in a cave, there are psychological ones as well. "Being trapped underground for ten days, in the dark with (little to no) food can be a harrowing experience for anyone, including veteran cavers," Rinaldi said. (Photos: Amazing Caves Around the World) "The first images brought to the surface by the (rescue team) who found the boys do show a very calm party, which is very reassuring," he added. Also, the fact that they are a team, stranded together, will probably bring them some comfort, he said. And now, phone lines will be set up inside the caves so that the boys can talk with their families, according to the BBC. Experts are saying it could take weeks, even months to rescue the boys, according to the BBC. Rescue teams are currently gauging their options: either wait for the children to recover their strength and teach them - none of whom know how to swim - how to dive through the flooded passageways, or wait for four months until the water recedes.