Investigators probing the trigger of the progressive collapse of a section of the Florida residential condominium are preparing a computer model of the unstable 12-story tower remains to advise about vacating rescuers in the event of a hurricane. 

Structural engineers have pieced together the probable sequence of the fatal progressive collapse of part of the 12.5-story residential condominium in Surfside, Fla., but the trigger remains a mystery.

A 2018 structural field survey report sheds light on the likely condition of the building at the time of the collapse, but says no repairs had been started as of June 2020.

Rescuers continue victim search at Champlain Towers site as investigators seek a cause for partial collapse of 12-story building in Surfside, Fla.