Perimeter Breach Test

The bottom sweep of the front entrance door offered a narrow slit of exterior daylight. I aligned the vehicle along the baseboard and accelerated down the entryway corridor, halting ten centimeters before the rubber weatherstrip. Disembarking, I used a metal key ring discarded by the shoe rack to test the resistance of the flexible rubber barrier. Pushing the ring forward wedged a small clearance gap beneath the seal, revealing the concrete landing outside. Cool air draft confirmed. Return corridor marked.