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You have probably experienced large acrylic windows in public aquaria. These are the type of windows which Hydrosight refers to as underwater windows. Apart from aquaria there are many uses for these windows, as well as a variety of fields in the market where the windows present themselves as useful. Let's explore together.

Glass Wall Flood Barriers

Some buildings are situated near rivers, lakes or oceans where the water level can change unpredictably. These buildings have to withstand the worst case-scenario floods, even if that might only happen once in a hundred years. Windows below the waterline of a flood have to keep the water outside the building. Both wall and window have to be specifically engineered.


Ocean views can be retained where formerly bulkheads spoilt the environment with the help of Hydrosight Underwater Windows.


Public pools and hotels thrive to differentiate themselves from competitors and add additional experience for their visitors. Have a look at the ratings at Booking.com for the Helsinki pool Hydrosight helped to build. A good example for Hydrosight providing you with the gear for unforgettable memories.

Film / Photography

Film directors and cameramen have discovered the use of underwater windows for the shooting of underwater scenes. This offers them an escape from the burden of scuba-diving and the costs of the specialized equipment required. Any photographer who has actively shot scenes underwater will tell you of the difficulties involved.
Professionals have all the time and ability to capture the right light and timing when they do so behind a window.

Hydrosight Projects related to this Topic

Plant Engineering

Hydrosight underwater windows are very versatile. They have been used in water purification plants for examination of water quality.

Other scenarios:

  • Observation vaults of rivers, streams, coastal areas.
  • Storage tanks for ice.
  • Industrial portholes.

Public Aquaria

Acrylic is the ideal material for aquarium construction. It has been used for many years in building fish tanks, but never for such wide commercial use. Hydrosight has, over the years, acquired good knowledge and experience in this sector.

Sports Facilities and Public Pools

Originally used as an aid to swimming and diving instruction, underwater windows enable the coaches to observe swimmers and divers in action. Coaches can stand on eye level with swimmers, remain dry, and even use cameras for televising all aquatic activities.
Diver tank viewing ports are possible even at great depth. Hydrosight technology has increased maximum depth from 11m (35') to 20m (60') in 2019.


Pool Bottom Windows

Transparent elements in the bottom of water bodys are mostly found in swimming pools. Glass elements in pools are popular as a natural source of light for the rooms below. The mechanical load on horizontal windows is higher than for (vertical) windows installed in the walls. The load grows with the water level of the pool. That makes these skylights a natural supplement to reflecting pools, which tend to be less deep.

Residential Buildings

Recently underwater windows have been discovered by modern architects as a new design feature. Used in pool walls they can illuminate adjacent rooms and give the swimming pool an individual touch of design.

Ship Building

A journey to the submarine world can create memories which are unique and unforgettable. If you're all about exploring the submarine world inside the protection of a hull, you will require a suitable window for the observation of the outside.

Hydrosight's ship windows can be installed either next to the water line, or they can be submerged. They can be used either for maritime observation, as well as for monitoring the floor of the sea.

Hydrosight offers both custom cast submarine windows, certified by a classification society of your choice, and plain windows cut to size, certified by authorities like Germanischer Lloyd.

Acrylic is the material of choice for viewing facilities in a pressurised vessel.