Rescuers are continuing to search for 6 men missing following Tuesday’s Baltimore bridge collapse. Reports say they were all low-income bridge maintenance workers from El Salvador, Guatemala, Honduras and Mexico. Investigators have recovered the data recorder from the 298m cargo ship, which lost power before ploughing into the 2.4km Francis Scott Key Bridge – named after the man who wrote US anthem The Star-Spangled Banner. Maryland Governor Wes Moore called the crew “heroes” who “saved lives” by making a mayday call that stopped vehicles going onto the bridge. The incident has raised questions about whether Aussie bridges are at risk – one expert says while safety measures are in place, the increasing size and weight of vessels means “we have to be vigilant”. Tasmanians of a certain age are all too aware of the risk after a similar disaster in 1975 left 12 people dead.