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The Heavily Guarded Cell (illustration)
FILE No.107Unsolved

The Heavily Guarded Cell

Difficulty ★☆☆about 5 minLocked RoomBlind spotsCeiling
A cell with perfect floors, walls, and bars, yet the prisoner escaped in one night. How?

Case Record

The police built a heavily guarded cell for a habitual escape artist.

  • The floor is solid concrete. No digging possible.
  • The walls are concrete, 2 meters high and 30 cm thick.
  • The barred door has five padlocks and a security sensor. Touching it sets off an alarm.

The next morning's scene photo showed nothing above the walls but blue sky. The prisoner escaped during the night.

Your question

How did the prisoner escape?

Case Files

Diagram

The cell seen from the sideWallWallInsideFloor: concrete (no digging)Walls 2 m high, 30 cm thick. Door: 5 padlocks and a sensor (alarm iftouched).Next morning's photo: nothing above the walls, only blue sky.
Diagram

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

List all the places that are protected.

Open hint 2

What place is not mentioned?

Open hint 3

Can a 2-meter wall be climbed?

Solve It

Your question

How did the prisoner escape?

Choose the answer closest to the truth.

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The Truth

Climbed over the wall, which had no roof

The answer is "Climbed over the wall, which had no roof."

The door was guarded by five padlocks and a sensor, and the concrete floor could not be dug through. The one thing not protected is the ceiling (roof). The walls are only 2 meters high, so they can be climbed.

Breaking a padlock would trip the sensor. The floor cannot be dug, and touching the bars sets off the alarm.

Guarded and unguarded pointsPartProtectionCan it be passed?Door5 padlocks + sensorNo (alarm)FloorConcreteNo (cannot dig)BarsAlarm on touchNoTop (roof)NothingYes: 2 m walls can beclimbed
Diagram of the solution

Key Points

  • Look for what is not protected
  • Notice what is not written
  • Choose a realistic method

Why people get fooled

Because heavy security makes you think there is no way out.

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