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In the storage tanks of factories, in the deep ditches at construction sites, and in the cellars of farms, those enclosed or semi-enclosed areas known as \"confined spaces\" often reveal their deadly nature unexpectedly. The suffocating sensation of lack of oxygen, the \"instantaneous poison\" effect of hydrogen sulfide, and the crushing force of sudden collapses… These invisible risks can turn into \"invisible traps\" that claim lives in the moment you bend down to work. Don’t let a \"small space\" lead to a \"major tragedy\" – when working in confined spaces, the three safety principles must be ingrained in our minds and put into practice: The first principle: Conduct inspections first before entering; relying on intuition or experience is a recipe for disaster! Before entering, it is necessary to use specialized equipment to measure the oxygen concentration in the space (levels below 19.5% or above 23.5% are considered dangerous), as well as the levels of toxic and harmful gases such as hydrogen sulfide, carbon monoxide, methane, etc. Even if it was \"entered just yesterday\" or \"seems pretty clean,\" it still needs to be retested—the environment changes rapidly, and data is the first line of defense for ensuring safety. Those home remedies such as \"sniffing with your nose\" or \"lighting a candle to check\" are completely ineffective against deadly gases; never risk your life on such chances! Second tip: Ensure good ventilation, and that it is adequate. Is the level of ventilation not up to standard? Don’t rush to put on your gear and charge in! First, open all ventilation openings and use devices such as axial flow fans and forced-air fans to force air circulation, thereby completely replacing the polluted air in the space with fresh air. Even in semi-enclosed spaces that appear to be \"ventilated,\" ventilation must continue for over 30 minutes before another measurement can be taken. Inadequate ventilation poses a risk of the accumulation of toxic gases and low oxygen levels, acting like time bombs that could explode at any moment. Remember: ventilation is not a mere formality; it serves as an additional safety valve for life. Third tip: Stay under close supervision and don’t work alone. The idea that \"working alone makes things faster\" could cost you your life! When working in confined spaces, it is necessary to have one person work while another acts as a supervisor. The supervisor must stand at the entrance and keep a close eye on the situation throughout, maintaining real-time communication through walkie-talkies or shouting, and should carry equipment such as life ropes, positive-pressure respirators, and first-aid kits. Once a cry for help is heard inside, the supervisor must never rush in to rescue them impulsively – they should first call the police immediately and then use appropriate equipment to carry out the rescue properly, thereby avoiding a chain of tragedies in which one person is in danger while others recklessly risk their lives. Confined spaces are full of dangers; three key words can keep you safe: First, conduct inspections to eliminate the root causes of hazards ； Ensure good ventilation to maintain respiratory safety ； Strict supervision to safeguard the bottom line of life. There are no trivial matters when working safely; remember the \"three-word formula\" to ensure that every operation in a confined space is completed safely