Four months after the tragic collapse of a wing of the 12-story Champlain Towers South residential condominium in Surfside, Fla., the Miami-Dade police gave private forensic investigators access to the site, but for measurements only.

The National Institute of Standards and Technology has added a remote sensing and visualization project to its roster of queries into the June 24 partial collapse of the Champlain Towers South residential condominium in Surfside, Fla., which killed 98 people.

Structural engineers call for more in-depth inspections of coastal buildings in harsh corrosive climates, and offer recommendations that go beyond visual surveys.

Under the county's equitable distribution program, the Miami-Dade Police Department is seeking a qualified local forensic engineer with high-rise experience and familiarity with concrete construction to study a recent collapse in Surfside, immediately north of Miami Beach. 

The National Institute of Standards and Technology team has collected more than 200 building elements while refining its procedures for evidence identification.

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.