From Realtà Mapei International n° 78 - 2/3/2020

The Under Restaurant

Snøhetta has designed Europe’s first restaurant below sea level. “Under” combines design and technology to astound diners, who are all amazed by this incredible sight and the technological challenge the project embodies.

Style, comfort and safety were the guidelines followed by the Norwegian firm, which turned to Mapei for repairing and smoothing the concrete, carrying out the structural bonding and waterproofing operations, and installing the tiles.

Location icon Lindesnes

The Under Restaurant is a monolithic structure made from reinforced concrete. It is 34 m long and slopes away into the sea down to a depth of 5 m, where it rests on the seabed just off Lindesnes, the most southerly point of the Norwegian coast, around a one and a half hour drive from the nearest airport and five hours from Oslo.

The interior spaces of the restaurant are protected by a 1 m-thick reinforced concrete shell designed to withstand the pressure of the water and the particularly harsh climatic conditions both above and below sea level. The designers decided to leave the exterior surfa-ces of the construction with a rough, exposed concrete finish to encourage the growth of seaweed and mussels below the waterline and to make the structure seem part of the rocky coastline where it is situated. Thanks to its particular location, the building is also intended to become an observation point to control the surrounding marine environment.


The structure is made from precast modules and is anchored to a block of concrete. A walkway links the rocky coastline to the entrance of the restaurant, which opens onto an interior space with a surface area of 600 m2 over three levels descending into the sea. On the top floor, or “zero” floor, there is the reception and cloakroom, followed by a bar at the mezzanine level and then a lower floor where the restaurant, with seating for up to 100 guests, is situated. The dining room has a panoramic window with a double layer of acrylic glass looking out directly onto the seabed.




Because of its special design and complexity, the project required a large range of high quality and technologically advanced products.

The products supplied included CONFIX*, CONFIX FIN* and REDIREP 45 RSF* to repair the concrete, epoxy resin-based products and hi-flow mortars for anchoring elements in place (such as MAPEPOXY BI*, MAPEPOXY LR*, MAPEPOXY L* and NONSETT 400*), MAPEFIX VE SF for chemical anchors, MAPEPRIMER M* epoxy primer for treating concrete substrates with surface moisture, PLANITOP FINE FINISH ultra-fine-textured skimming compound for exposed concrete, RESFOAM 1KM and RESFOAM 1KM AKS* resin for waterproofing structures subject to intense water seepage and SUPERFLYT* super-plasticising admixture for mortars. ULTRABOND MS RAPID adhesive was chosen for its high sucker effect and rapid setting properties to install the 3D ceramic tiles in the bathrooms.

*These products are manufactured and distributed on the Norwegian market by Mapei AS (Norway)



Project data sheet

Yard flooring, concrete structure
Location Lindesnes, Norway
Subcategory RESTAURANT
Built in 2018
Opened in 2019
Application Supply of self leveling flooring products, concrete admixtures, concrete rehabilitation products, injection products and waterproofing products
Start and finish date 2018/2019
Application Type Admixtures for concrete, Floor/wall covering, Anchoring, Waterproofing systems
Client Lindesnes Havhotell
Contractor company BRG Entreprenør AS
Installer companies Rencon AS, Murermester Arnt Kristensen AS
Architects Snøhetta
MAPEI Distributor Mapei A/S
Credits Tomasz Majewski Photography, Trond Helgedagsrud
Project Manager Dag Terje Håland
MAPEI Coordination Trond Helgedagsrud and Alexander Kristensen, Mapei AS (Norway)
Link to details page

Products mentioned in the article

Styrene-free, hybrid vinyl resin-based chemical anchor for structural loads. Certified for threaded bar, construction bars and C1 seismic…
Ultra fine textured skimming mortar for concrete; recommended for exposed finish surfaces. TECHNICAL DATA: Maximum size of aggregate: 0.2…
One-component, ultra-fluid polyurethane resin applied by injection for waterproofing structures and ground and rocks subject to intense…
Rapid-setting, deformable, hybrid assembly adhesive for internal and external use, with a high initial sucker effect. TECHNICAL DATA:…

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