Question: How many shops are in the underground shopping centre under the towers of the complex connected by tunnel to another complex in Downtown Montreal through the Atwater metro station?  

Context articles: Place de Ville
Complexe Maisonneuve
Montreal Eaton Centre
Asematunneli
Alexis Nihon Complex
Starfield COEX Mall
Westmount Square
Heron Quays DLR station
Underground City, Montreal
Landmarks of Montreal

Place de Ville is a complex of office towers in downtown Ottawa, Ontario, Canada.
 It consists of four office buildings: Place de Ville A, B, and C; and the 'Podium' building.
 The complex also has two large hotels, the Ottawa Delta City Centre (411 rooms) and Ottawa Marriott Hotel (487 rooms), as well as the city's largest underground parking garage with space for 974 cars.
 The buildings are linked by an underground shopping complex.
 Place de Ville C is the tallest building in Ottawa.
 It was once advertised as "Ottawa's glittering answer to the Toronto Dominion Centre and Place Ville Marie".
Complexe Maisonneuve is an office building complex in Montreal, Quebec, Canada.
 Complexe Maisonneuve is located on De la Gauchetière Street West between University Street and Beaver Hall Hill.
 It is situated facing Victoria Square in the Quartier international district of Downtown Montreal, and is linked to Montreal's Underground City and Square-Victoria-OACI Station on the Montreal Metro.
 The complex consists of two buildings, the Tour de la Banque Nationale and 700 de La Gauchetière.
 It was constructed in 1983, and the two towers share an underground base six floors deep.
The Montreal Eaton Centre is a shopping mall located in Montreal, Quebec, Canada.
 It is located in the heart of Downtown Montreal in the underground city, and is connected to the Montreal Metro via McGill station.
Asematunneli (Swedish: "Stationstunneln" ) is an underground shopping center connecting the Helsinki Central railway station and City-Center in downtown Helsinki, Finland.
 The area also has a ticket sales area for the Rautatientori metro station and connections to the nearby Forum shopping mall as well as Stockmann and Sokos department stores.
 The shops and supermarkets in Asematunneli are licensed to stay open longer than normal as well as during the national holidays, making the shopping center an important location for last minute and emergency shopping for the people of the greater Helsinki area.
 Kamppi Center and the bottom floor of Sähkötalo across Fredrikinkatu can also be accessed via underground tunnels by going through the Forum shopping mall first.
 The interconnecting areas provide for convenient movement across a wide area of central Helsinki, and allow pedestrians to escape the rain, snow, and cold weather that dominate much of the Finnish calendar.
Alexis Nihon is a 223000 m2 complex in Downtown Montreal, Quebec, Canada (on the border with Westmount), consisting of a shopping centre, two office towers, and a residential building.
 The shopping mall is directly connected to the Atwater metro station, which joins the building by a short tunnel with the adjacent Dawson College, and by a longer one adjoins nearby Westmount Square.
COEX Mall, containing COnvention centers, EXhibition halls and many malls, is an underground shopping mall in Gangnam-gu Seoul, South Korea.
 It has an area of about 154,000 square metres, of which 144,000 square meters are on a single underground floor, making it the world's largest underground shopping mall.
 The mall is located at Samseong-dong served by Samseong Station on Seoul Metro Line 2, at the intersection of Teheranno and Yeongdong Dae-ro.
 The COEX Mall is adjacent to the COEX Convention & Exhibition Center, which is part of the COEX complex, run by the Korea International Trade Association (KITA).
Westmount Square is a residential and office complex located in Westmount, Quebec, Canada.
 There are two of residential apartment buildings, and two office buildings.
 These towers sit atop an underground shopping centre consisting of thirty-five shops.
 It is located between Saint Catherine Street and De Maisonneuve Boulevard and between Wood Avenue and Greene Avenue.
 It is connected to Place Alexis Nihon and the Atwater Metro station by an underground tunnel.
Heron Quays is a station on the Docklands Light Railway (DLR) in the Heron Quays area of Canary Wharf in Greater London, England.
 The station is situated on the Isle of Dogs within the East End of London and serves the southern part of the Canary Wharf office complex and is directly connected to that complex's Jubilee Place underground shopping centre.
 The station is elevated and contained within one of the complex's office towers.
RÉSO, commonly referred to as The Underground City (French: "La Ville Souterraine" ), is the name applied to a series of interconnected office towers, hotels, shopping centres, residential and commercial complexes, convention halls, universities and performing arts venues that form the heart of Montreal's central business district, colloquially referred to as Downtown Montreal.
 The name refers to the underground connections between the buildings that compose the network, in addition to the network's complete integration with the city's entirely subterranean rapid transit system, the Métro.
 Moreover, the first iteration of the Underground City was developed out of the open pit at the southern entrance to the Mount Royal Tunnel, where Place Ville Marie and Central Station stand today.
Montreal's Underground City (French: La ville souterraine) is the set of underground city complexes in and around downtown.
 It is also known as the indoor city (ville intérieure), as not all of it is underground.
 With over 32 km of tunnels spread over an area of 12 km2 , the 60 residential and commercial complexes comprise 3.6 km2 of floor space, including 80% of all office space and 35% of all commercial space in downtown Montreal.
 Services include shopping malls, hotels, banks, offices, museums, universities, seven metro stations, two commuter train stations, a bus terminal and the Bell Centre hockey arena.
 There are more than 120 exterior access points to the underground city.
 Some 500,000 people use the underground city every day, especially to escape the traffic and/or Montreal's harsh winter.