Although the technology has improved over the years People have not finished studying the world. Sci-fi children about the mysterious underwater world For those who like it, I present a short survival thriller story. If I have to introduce a short story... To find and study the minerals and materials in the hydrothermal zone in the deep sea A small submarine called Explorer into the deep sea Unexpected soil at the bottom of the sea when diving Because of the change, the submarine Falling into a waterfall under the sea and with ropes from a shipwreck They were so tired that they couldn't get back on the water. The only option for them was to wait for the rescue team... Limited oxygen for four people in a submarine; Because of limited electricity When every second of breath is precious and important...