Those are pictures taken in the Montreal Underground, the biggest one in the world. We can walk few hours before to see the end of it. A lot of stores, exotic restaurants, hotels, train station, etc... I used a Kodak Professional BW400CN and my Canon AE-1Program for the b&w and my wife's camera for the color ones, a Kodak Easyshare C330.

City under the City
To Montrealers, it goes by the name "the underground city" or simply "the underground". They're actually referring to the vast network of pedestrian walkways spread out below the city. To put a number on it, there are 30 kilometres of connecting areas, passageways and hubs beneath the downtown.
More than 500,000 people pass through the underground city every day, on their way to work, university or to scope out bargains at the over 1,700 boutiques and businesses. The many passageways also serve a more leisurely purpose; connecting certain métro stations, the underground provides access to about 40 theatres, cinemas and other entertainment venues, as well as restaurants, tourist attractions and museums.
The concept of underground commerce began in 1962, with the lower level shopping mall in Place Ville Marie, Montréal's first skyscraper. With the coming of Expo '67 to the city, Montréal's long-standing dream of a métro finally became a reality.
Following this, the underground went through multiple stages of development. Without a doubt, one of the more spectacular periods was the raising of Christ Church Cathedral on piles, in order to lay the foundations for a shopping centre underneath it.
As of March 2003, another series of passageways will extend the existing network to include a quadrant in the new Quartier international. A focus on arts and culture will be favoured over commercial activities, with display windows and alcoves presenting the richness of Montréal's museum collections.
Sheltered from the elements - winter's cold or summer's heat - Montrealers continue their busy lives and tourists take a break from theirs, underground.
(informations taken from Tourisme Montreal)