Miami building collapse: How are drones, sonar and other technology aiding Florida rescuers' search?

Florida search teams have been using drones, sonar, microphones and a range of other technologies to help with the collapsed Surfside condo building.
Read more: https://www.usatoday.com/story/tech/2021/06/25/miami-condo-collapse-missing-victims-search-technology-drones/5349897001/?source=Snapzu