What seems to be the perfect plan of a group of fishermen from Zeebrugge, unravels after the intervention of the newly formed special forces undercover team.

There is a riot in the Leuven prison. The DSU prepares to force the prisoners back into their cells. When they arrive, the atmosphere is relatively calm, but there is blood on the ground and the jailers are in shock.

At the end of the turbulent 1980s, a tiger kidnapping in the village of Tilff gets completely out of hand. French top gangster Philippe Delaire, along with two companions, holds the family of a banker hostage.

Brussels Federal Judicial Police investigators suspect a man from Anderlecht is collecting weapons to carry out an attack, but do not have enough evidence to arrest him.

The Swedish Ulrika Bidegård disappears in 1993. Her father is a wealthy businessman with a riding school on the outskirts of Brussels. Special forces negotiators move in with the family, hoping to get phone calls from the kidnapper.

13 of the original 41 candidates for the arrest and intervention team start the most dreaded test: the pool test. The test is sometimes called the 'drowning test' because every year a number of candidates lose consciousness.

"Under the Radar" follows the story of five young recruits who want to join the special forces at any cost. Four of them want a spot on the intervention and arrest team, where their physical preparedness is put to the test.