Tham Luang: The 12 boys trapped deep inside the Tham Luang cave in northern Thailand have asked for fried chicken, not too much homework and, heartbreakingly “to go straight home” in a series of letters to their parents released on Saturday morning.

The note penned by the Thai Navy SEAL who is staying with the boys in the cave.

And the 25-year-old soccer coach trapped in the cave with his charges has apologised to all of the parents of the 11 to 16-year-olds.

As the team enters their 14th day trapped in the cave complex, and rescuers grapple with a range of options to free them as heavy rain approaches, the letters offer a glimpse of what they are going through.

At a briefing at 3am on Saturday morning (AEST), before the release of the letters, Chiang Rai province Governor Narongsak Osottanakorn said the boys were still learning to swim and dive and were not yet ready to attempt the perilous escape from the cave. Oxygen levels in the cave are also a concern.