Archive · 28 Dec 2025
Chinese Students Crack Safe Using Chalk Dust
Some students in a Chinese school found a clever way to open a safe that kept their phones.
They used chalk dust to see the numbers that had been pressed on the safe's keypad.
This helped them figure out the secret code.
The school found out and punished the students.
The safe was then moved to a safer place.
People on the internet talked about it, some saying the students were smart, and others saying they were just being mischievous.
Students used chalk dust to reveal pressed numbers on a safe's keypad.
They successfully cracked the code and accessed the phones inside.
The school issued a disciplinary notice and punished the involved students.
The safe's combination was changed, and it was moved to the teachers' office.
The incident sparked discussions on Chinese social media, with mixed reactions.
- Who
- Students at a high school in Shenzhen, China
- What
- Cracked the code of a classroom safe using chalk dust
- When
- November 14 (incident), December 10 (disciplinary notice)
- Where
- Shenzhen, China
- Why
- To access mobile phones kept in the safe
- Location
- Shenzhen, China
- School Type
- Boarding School
- Incident Date
- November 14
- Disciplinary Notice Date
- December 10
- School's Policy
- No mobile phones on campus
- Punishment
- Consistent with internal regulations
- Safe's New Location
- Teachers' office