As authorities in Florida try to reach people who have been trapped by floodwaters or isolated on barrier islands since Hurricane Ian came ashore last week, concerned members of the public have been springing into action to aid the official rescue efforts. One such group, Project Dynamo, has rescued more than 20 people, many of them elderly residents who became cut off when the Category 4 storm washed away a bridge connecting the Florida mainland with Sanibel Island, a crescent-shaped sliver of sand popular with tourists that was home to about 7,000 residents. Others have joined in the rescue efforts, using boats, paddleboards, jet skis and other resources to find people stranded by floodwaters or cut off by damage.