Like Phase 1, the sections between stations will largely be constructed through the use of TBMs, while stations will be constructed through cut-and-cover and mining, allowing for the construction of station caverns, shafts, and entrances. Five transfers are planned to connect stations on the Second Avenue Line and nearby stations on adjacent lines, increasing travel options for passengers. The transfer at Grand Street will require the construction of a mezzanine below the existing station, allowing for a vertical transfer to be constructed. The existing station will have to be rebuilt to accommodate the increased volume of passengers using the station. The Houston Street station's transfer to the Second Avenue station of the IND Sixth Avenue Line would require some construction within the existing station. The remaining three transfers are being proposed, and will be constructed, baring the increased cost of their construction. The transfer to the BMT Canarsie Line's Third Avenue station would consist of a passageway that will be long. The most complicated of the transfers will be the connection between the 42nd Street station and the Grand Central station on the IRT Flushing Line. To allow for the connection to be built, a 900-foot long tunnel would be built under 42nd Street from the west side of Third Avenue to Second Avenue. The Flushing Line station might have to be significantly reconstructed in anticipation of the increased volume of passengers and due to Americans with Disabilities Access requirements for the transfer. To allow for necessary vents and emergency exits to be built, cut-and-cover would be used. The final transfer would be between the 55th Street station and the Lexington Avenue–53rd Street station on the IND Queens Boulevard Line. Either shielded mining or cut-and-cover would be used to complete the connection. The existing station would have to be modified to allow for the transfer passageway to be built.