Hoffmann's improvised explosive device

Hoffmann's improvised explosive device is a concealed assembly of a detonator, receiver, pentyl fuse, and nitroglycerine, which Piet Hoffmann extracts from a modified book and later uses in the prison workshop. Its parts are small enough to hide among ordinary objects, but their arrangement makes them central to the dangerous scene Hoffmann engineers inside Aspsås Prison.

Concealed Components

Hoffmann finds the device's components inside the thick covers of a book. A concealed compartment contains a nail-sized detonator and a penny-sized receiver; a further cavity yields two nine-meter lengths of pentyl fuse and a thin plastic envelope holding twenty-four centilitres of nitroglycerine. The concealment depends on the book's ordinary appearance: its covers and glued hinge disguise materials that can be repurposed once removed.

The receiver is not merely hidden. At the workshop, Hoffmann places it in his ear and listens toward the church tower, confirming that it picks up a signal from a transmitter. The evidence establishes this check as part of the device's preparation, though it does not specify the mechanism by which the receiver would trigger an explosion.

Assembly in the Workshop

Hoffmann's familiarity with the workshop supports his control over the device's assembly. He has noted the surveillance cameras, the workbenches and pillars, the diesel barrel, and the locations of tools and supplies. When Martin Jacobson and another prisoner are restrained in the room, Hoffmann takes the concealed materials to a workbench and begins preparing an explosive arrangement.

He cuts the nitroglycerine-containing material into twenty-four equal portions and tapes them onto the unnamed prisoner's clothing and body. He then wraps several meters of pentyl fuse around the prisoner. These actions transform components previously hidden in a book into a distributed, body-borne threat. The scene also places the device within the workshop's hostage situation, where Jacobson witnesses Hoffmann's actions but cannot make sense of them.

Function and Significance

The device's construction is an extension of Hoffmann's ability to adapt to a closed environment. A book, a receiver, fuse, and concealed explosive material become resources within a prison where movement and access are controlled. Its parts are prepared in stages, first hidden, then retrieved and assembled under pressure, rather than appearing as a ready-made weapon.

The device is significant both as a practical threat and as part of Hoffmann's manipulation of the workshop crisis. Its assembly around a restrained prisoner makes the danger visible to those present and helps shape the desperate choices unfolding in the room. The evidence describes the preparation and placement of the materials, but does not establish here whether this particular arrangement detonates or what its final outcome is.