The rescue mission faced challenges when the passage ① used to
enter the cave became submerged. Rescuers from different countries
collaborated and explored various rescue options. They considered
waiting for the rainy season to end or ② finding other ways to reach the
boys by drilling through the cave walls. However, with more heavy rains
anticipated, a risky but final decision ③ was made to bring the boys out in
groups using diving equipment. It was this alternative solution ④ that
enabled the rescuers to reach and save the boys in time. Without this
approach, the rescuers ⑤ would face even greater challenges, and they
might not have been able to rescue the young lives.