 Line 4 (Yellow Line) would therefore pass under the river, from Berri-de-Montigny station, junction of Line 1 (Green Line) and Line 2 (Orange Line), to Longueuil.A stop was added in between to access the site of Expo 67, built on two islands of the Hochelaga Archipelago in the river.Saint Helen's Island, on which the station of the same name was built, was massively enlarged and consolidated with several nearby islands (including Ronde Island) using backfill excavated during the construction of the Metro.