>>159 の続き

あれ？
https://cdn.images.express.co.uk/img/dynamic/78/590x/thai-cave-rescue-news-thailand-football-team-trapped-984556.jpg?r=1530831598372
https://akm-img-a-in.tosshub.com/indiatoday/images/story/201807/cave4.jpeg?x6xI6_n72jl804seh7AiQJldiXAKhgCA
https://www.newshub.co.nz/home/world/2018/07/thai-cave-rescue-no-backdoor-entrances-found-rain-on-the-way/_jcr_content/par/image.dynimg.full.q75.jpg/v1530819756733/D_THAIKIDS_CAVE_CROSS_SECTION_05_07.jpg
ゴムボートを要所要所に配置すれば潜水時間を短縮できんるんじゃないの？