Scientists want to detonate the device in calm weather or in steady winds so any radioactive gas that accidentally escapes can be easily tracked.

Primarily, the rifle's bolt head was modified for better venting of gases that could accidentally escape from a ruptured cartridge head.

It's up to a pound per square inch less in here than outside, so no pathogens can escape accidentally.

But developing countries say commodities should be included because they contain seeds that can be planted or can accidentally escape into the environment.

The amount of plutonium that accidentally escaped from Rocky Flats has never been established, and scientists have long been at odds about the health risk.

He scans Agent Fowler's jet which he uses to escape as Wheeljack accidentally blows up a gas station.

The Drone-Captain was in a sheet-laser cell, so that he could not even accidentally escape the box.

But during the second take, the cougar accidentally escaped from the cage, resulting in shooting being paused for a few hours.

A bear from the zoo accidentally escapes out of the zoo, for which the hero is held responsible.

The next year, two cases occurred in England because the virus accidentally escaped from a research laboratory.