Responsible for the conceptual design of the tunnel, AINS Group and Pöyry signed a framework agreement with Finest Bay Area Development Ltd on design services for the planned railway tunnel between Finland and Estonia. The agreement lays out the ground rules and division of duties in the design of the project.

“We are delighted to sign the framework agreement, which enables us to speed up technical design in the project and enhance the environmental impact assessment and environmental consultation. The agreement further reinforces our excellent co-operation with the customer and with AINS Group in this highly extensive project,” says Pöyry’s Markku Oksanen.

“We are currently focusing on creating safe, environmentally friendly, and financially sustainable design solutions,” says Timo Saanio, vice president, AINS Group, continuing: “We will build the world’s longest undersea railway tunnel and are at the same time developing a completely new type of concept for implementing mega-projects, which is already attracting international interest.”

Determining the best route for the Tallinn tunnel

In the draft plans, the 100-kilometre-long tunnel has two parts and runs as deep as 200 meter below sea level. There will be four stations along the route. Several alternative routes are being investigated in aims of finding the safest and most cost-efficient solution. However, further investigation related to the ground, safety technologies, train technologies, and tunnel-driving technologies can already begin, along with preparations for various permit processes.

“We have detected a fairly large fracture zone below the Gulf of Finland. You encounter these every now and then in tunnel projects. The next step is to investigate the conditions further and determine the route for the tunnel. The construction methods and tunnel structures will be adapted to existing conditions. This is normal practice in tunnel projects,” says Saanio.

“The agreement is a continuation to the excellent co-operation with AINS Group and Pöyry, and it takes the project another step forward. The project has been created and promoted step by step with passion and determination over the last three years. Now we are able to launch more detailed technical planning, and it is a pleasure to do this with the best providers in the world,” says Peter Vesterbacka of Finest Bay Area Development Ltd.

Finest Bay Area Ltd started the conceptual design work for the undersea railway tunnel in co-operation with Pöyry and AINS Group in May 2018. The environmental impact assessment (EIA) programme was submitted to Finnish authorities in January 2019.

Further information:
Timo Saanio, Vice President, AINS Group
Tel. +358 40 506 5671

Markku Oksanen, Pöyry Finland Oy
Tel. +358 40 527 6163

Kustaa Valtonen, Finest Bay Area Development Ltd
Tel. +358 50 415 5300



What is the Tallinn tunnel project?

Finest Bay Area Development

Private development company Finest Bay Area Development Oy is planning to build the world’s longest railway tunnel, between Finland and Estonia.

The world’s longest railway tunnel

Upon its completion, the tunnel will be 100 kilometres long and be the world’s longest one designed for the transport of passengers and goods.

From Helsinki area to Tallinn in 20 minute

It is intended in particular for use by fast trains, with the expected travel time from Finland to Estonia being about 20 minutes.

200 m below sea level

According to the current draft plan, the tunnel will have two parts and run as deep as 200 meters below sea level.

Various alternative routes

Various alternative routes are being currently investigated. The plan includes four to six stations along the route, for instance Tallinn Ülemiste Airport, “The Island” (UusiSaari), Otaniemi-Keilalahti (OtaKeila) and Helsinki-Vantaa Airport.

The EIA program submitted in January 2019

Conceptual design of the Finest Bay Area project began in May 2018, simultaneously with the environmental impact assessment (EIA) process. The EIA program was submitted to Finnish authorities in January 2019.

New metropolitan area with over 2 million residents

The plans include construction of residential and office areas for 50,000 people around each station. The new Tallinn metropolitan area will be an economic area with over 2 million residents that overtakes cities such as Amsterdam and Stockholm in size.

Underground route connecting the two cities

The tunnel will serve as an underground route connecting the various district of the two cities, enabling fast and flexible travel between them.

A framework agreement of the design work signed October 2019

AINS Group and Pöyry have been responsible for the conceptual design of the project in partnership with Finest Bay Area Development. On 10 October 2019,the parties signed a framework agreement on preparing the organisation and process for the next engineering phase.

Experts mastering tunnel and infrastructure megaprojects

AINS Group and Pöyry are highly skilled experts mastering tunnels, underground spaces and mega scale infrastructure projects.