The story begins with the friends partying in a hot tub on New Year's Eve in 1986. During their revelry, they stumble upon a strange-looking hot tub that they decide to fix and use. Unbeknownst to them, the hot tub has been imbued with the power of time travel. When they soak in it, they are transported back to 1986.

As the friends navigate their way through high school again, they face various challenges and comedic misadventures. They must confront their past selves and try to change their futures without disrupting the timeline.

Kisahnya dimulai ketika keempat sahabat ini berpesta di bak air panas pada Malam Tahun Baru 1986. Selama kegembiraan mereka, mereka menemukan bak air panas yang terlihat aneh dan memutuskan untuk memperbaikinya. Tanpa diketahui mereka, bak air panas tersebut telah diberi kekuatan untuk melakukan perjalanan waktu. Ketika mereka berendam di dalamnya, mereka dibawa kembali ke tahun 1986.

I'm assuming you're referring to the 2010 American science fiction comedy film "Hot Tub Time Machine" and you'd like an essay about it with Indonesian subtitles or references, which I'll assume as "sub indo". However, I'll provide a general essay on the movie and try to incorporate some Indonesian references where possible.