For a large-scale tunnel fire exercise of the Volunteer Fire Brigade Überlingen, a pulsFOG K-30 BIO was used to rapidly generate dense fog inside the widely branched tunnel system. The goal of the exercise was to simulate realistic visibility conditions for rescue and firefighting operations under demanding circumstances.

Using standard stage fog fluid, large amounts of non-hazardous fog could be produced within a very short time, allowing the emergency teams to train under highly realistic conditions.

Due to the confined environment and the complex tunnel structure, the pulsFOG K-30 BIO was selected for its combination of:

- high fog output

- fast area coverage

- compact design

- excellent maneuverability

The exercise demonstrates how pulsFOG technology can support applications far beyond agriculture, hygiene or pest control — especially wherever reliable and efficient fog generation is required.

A Unique Historical Connection

The tunnel system in Überlingen also carries a remarkable technological history. Parts of the underground facilities were historically connected to early pulse jet technology development during World War II.

This engineering principle later became the technological foundation for pulsFOG thermal fogging systems.

Today, the same fundamental pulse jet principle is no longer associated with military applications, but is used worldwide in modern civilian sectors such as:

- public health

- hygiene and disinfection

- agriculture

- pest control

and emergency training scenarios like this exercise.

This transformation from historical propulsion technology to modern civilian fog generation technology represents a unique chapter of engineering development.

We would like to thank the Volunteer Fire Brigade Überlingen for the excellent collaboration and for their important commitment to public safety.