(英: log house ) - Wikipedia
(ttps://www.youtube.com/watch?v=vyjIkRhIEVQ )
survival
(ttps://dictionary.goo.ne.jp/word/en/survival/ )
(ttps://www.youtube.com/watch?v=stIjgEaES60 )
underwater
(ttps://www.youtube.com/watch?v=T05x_siXvWs )
(ttps://www.youtube.com/watch?v=8cn2TZAGAbQ )