Today on “Post Reports,” reporter Teo Armus walks us through what we know about the Baltimore bridge collapse — and what it says about the lives — and tragic deaths — of immigrants in tough construction jobs.Read more: Authorities are turning their focus to “salvage” operations to remove wreckage from the Patapsco River after a massive container ship caused Baltimore’s Francis Scott Key Bridge to collapse. Meanwhile, investigators have recovered the ship’s black box and are piecing together the final moments before the crash.Teo Armus has been reporting on this for The Post, and he walks us through the latest. Six presumed dead in bridge collapse were immigrants, soccer fans, family menBridge collapse brings stark reminder of immigrant workers’ vulnerabilities