Start EN2023-05-08T10:48:43+02:00

Big Bubble Barrier

The best way to limit under water noise!

Big Bubble Barrier

The best way

to limit under water noise!

Our core competencies

Underwater Noise Protection
Noise Protection
Oil Barrier
Diving Walls


Offshore noise protection
Oil barriers
Diving walls

Environmental protection and technical progress from one single source

Compressed air underwater can be used in many ways

HYDROTECHNIK LÜBECK brings environmental protection and technical progress into harmony. The Big Bubble Barrier was developed for offshore noise protection in wind farm construction sites – a compressed air system that can be used flexibly to reduce noise emissions during pile driving and protect all marine life forms during ammunition clearance underwater blasting. Special nozzle hoses and hose winches have been developed for this work at sea. Experienced teams are now working around the world for environmental protection. In Germany, this development is considered to be “state of the art.” In addition to oil barriers, compressed air barriers, ice prevention systems, and the creation of complete protective systems for seawater desalination systems, underwater noise protection is our most important task.

In the case of alarm, yellow is our signal colour.

In the case of alarm

yellow is our signal colour

„State Of The Art“

The Big Bubble Curtain
is considered in Germany as
„State of the art“

The Big Bubble Curtain has its origins in the technology of compressed air barriers, which Hydrotechnik Lübeck has been using for more than 50 years to protect against floating debris and oil.
The Big Bubble Curtain has been used around the world since 2008 for construction work on almost all offshore wind farms and for blasting work in the North and Baltic Seas.

You want to know more?

Play the video.

You want to know more?

Play the video.

You want to know more?

Play the video.

Industrial Building Protection

Modular system

In rain-poor countries, seawater desalination plants are often the only way to supply people and agriculture with fresh water. We have specialized in the water-side functional and building protection of these large-scale systems. There are two main dangers: oil pollution and damage from floating debris. For long-term protection, compressed air oil barriers on the open sea and floating diving walls inside are the best choices. Mobile security consists of oil rescue devices such as skimmers, floating oil barriers and boats for acute oil control.


162 barrier
127 barrier
26600 m
972 m
Zertifizierung ISO

ISO 14001:2015

Environmental Policy

HYDROTECHNIK LÜBECK GMBH is committed to protecting the local and global environment of the earth.
To minimize its environmental impacts concerning our activities, products and services, we shall:

  • Comply with applicable legal requirements and other requirements to which the Company subscribes which relate to its environmental aspects.
  • To include the consideration of environmental issues in all business strategies and initiatives.
  • HYDROTECHNIK LÜBECK GMBH senior management are committed to ensure that protection of the environment is firmly embedded in both our company’s and employees culture and will endeavour to influence its suppliers and customers in a similar strategic environmental manner.
  • Prevent pollution, reduce waste and minimise the consumption of resources.
  • Consider the wider global impact of all our activities including those of our suppliers, customers and other stakeholders.
  • Educate, train and motivate employees to carry out tasks in an environmentally responsible manner and ensure that a continuous professional development strategy remains core to our business goals.
  • Encourage environmental stewardship among suppliers and subcontractors.
  • To investigate the feasibility of influencing its suppliers, customers and third parties with particular consideration to life cycle impacts of their significant aspects and activities.
  • Encourage and enhance biodiversity and ecology. The Company is committed to continual improvement of environmental performance. This Policy will be communicated to all staff, contractors and suppliers, and will be available for the public in a manner chosen by HYDROTECHNIK LÜBECK GMBH.

Endorsed by Cay A. Grunau, CEO of HYDROTECHNIK LÜBECK GMBH

Cay Grunau, CEO

Cay A. Grunau

Mission Statement

I am a civil engineer in the hydraulic engineering department by conviction. This professional goal has been clear to me since I was allowed to accompany my father in constructing the Ennepetalsperre in the Sauerland at the age of 12. The nature on our planet is just too beautiful and essential for us. So we have to protect it where it is in danger. Is there anything more excellent than being active on the water and underwater, and at the same time making your contribution to the protection of the animal world, nature, and the environment?
Except for the smiles of my wife and children. ?

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