A last-ditch meeting between Transport for London (TfL) and unions to prevent tomorrow's Tube strike fell apart after the RMT union left the talks declaring the strike would go ahead.
The Transport Salaried Staffs Association (TSSA) union and London Underground remain in talks at conciliation service Acas.
John Leach, regional organiser for RMT told reporters London Underground's position has not changed its offer throughout the week. He said the unions want guarantees a "significant number" of staff will be hired to keep the lines safe, whereas, he added, "They've just offered us a Band-Aid on a gaping wound."
A spokesperson for TfL has said: "Talks have concluded for the day. We have made a proposal to the unions and we await their response."
The walkout, which will affect most London Underground lines, is set to start at 6pm Sunday and carry on for 24 hours into Monday evening.
Members of the RMT and TSSA unions have been locked in a dispute with TfL over a ticket office closure programme that was completed last year.
The strike is set to have a massive effect on commuters as TfL has warned the majority of Zone 1 stations will be closed.
Previous talks crumbled yesterday with no conclusions. TSSA said TfL's offer needed to go "far further".
Steve Griffiths, London Underground's chief operating officer, said 150 extra staff would be recruited, adding, "This number is bound to increase as we work through the other areas that need to be addressed."
TSSA has said the 150 new recruits is not enough to improve services to passengers and reduce the pressures on staff.
If the strike goes ahead, here's what to expect
Piccadilly line services will run between Hammersmith and Heathrow Terminals 1, 2 and 3 and DLR services will be running but may terminate before Bank station.
Although National Rail services will not be affected by the strike, there will be no Tube running from key interchange stations like Victoria, King's Cross, Waterloo, Paddington, Euston, Bank and London Bridge.
There will be no service on the Victoria and Waterloo & City lines, and TfL said all other lines would be severely affected, with "limited services" in outer London.
About 100 extra buses will be running and river services will be "enhanced".