A Thai official said two members of the engineering team dispatched by billionaire entrepreneur Elon Musk are due to arrive late Saturday to help with efforts to rescue 12 boys and their soccer coach trapped in a flooded cave.

Another engineer was already in the country on holiday and six more are expected to land Sunday, Weerachon Sukhontapatipak, a spokesman for Thailand's military government, said in a Saturday briefing in Bangkok. They may provide help such as trying to drill a tunnel to save the group, he said.

The boys and their coach have been trapped in the cave system in the country's north for about two weeks, with heavy rainfall looming in the days ahead. Rescuers are scrambling to lower water levels with pumps and prepare the group for a perilous, hours-long extraction that will include diving through pitch-black water with scuba gear.