Heathrow Airport will construct a third runway by 2026 and complete its expansion by 2050, according to its “masterplan” published on Tuesday.
The plan includes diverting rivers, moving roads and rerouting the M25 through a tunnel under the new runway.
Heathrow’s expansion has faced fierce opposition, but the airport says it has engaged with local communities and other stakeholders.
The proposals are now open to public consultation until 13 September.
The masterplan is illustrated in a visualisation from the architects, showing the M25 running in a tunnel underneath the new runway.