[W]hen rescuers returned on the fourth day, the remaining four dolphins had left the area. NOAA couldn't move all the dolphins at once because they had limited equipment and only one pool to put them in.

"This area is so damaged," Foster said. "There's not many swimming pools, not many holding areas ... so what we did was take the most compromised animals and move them to the Holiday Inn (swimming pool)."

When the last four of the dolphins were located on Tuesday, they were in the channels in front of the Beau Rivage Casino. All of the dolphins have since been reunited and are on their way to recovery.

"We're all just thrilled that the dolphins are now safe and sound," said NOAA Fisheries Service biologist Laura Engleby. "Certainly we were really concerned about the challenges they were faced with out there. We were so excited to see that they were all together. This has just been a huge success."