MAKATI CITY, Philippines--3D walkthrough showing the layout of the Glorietta 2 basement, including the location of the sump pits and diesel fuel tank. Authorities have said that a buildup of gases in the basement, namely a combination of methane from the sump pits and fumes from the diesel tank, caused the explosion at the Glorietta 2 mall in Makati City that killed 11 people and injured more than 100 others on October 19. Ayala Land, the owner of the Glorietta mall, is disputing the accidental gas explosion theory. Video provided by Ayala Land.