If you thought that you've seen the most brutal act in the world - think again: ISIS publicized a video clip, depicting the cruel execution of "spies.".
The spies were imprisoned in a cage and taken out to sea, where they died by drowning.
The Islamic terrorist group claimed that 16 men were killed in Nineveh,
Iraq, in a set of horrifying killings after being accused of spying.
In the first round of executions, five terrified men can be seen being lowered into the water while locked in a cage together.
Minutes later, the cage is lifted, showing the men lying motionless on the cage