The crew could not figure out how to moor the boat. The boat is supposed to be anchored and then tethered float boards with lights are deployed behind the boat for people to hang on to while the Mantras swim around the boards. After driving around for well over an hour trying to find a mooring anchor, the captain was unsuccessful and deployed the tour group and 2 crew members holding the boards into the water. We were out in the water without being tethered to the boat with two of the crew trying to keep the large group of people in the area to view the mantas. During this time the captain drove the boat around us. This was unnerving to have active motors around us while we floated near the boat. Time in the water was minimal due to risk. The crew could not keep the boards and people in the correct area. Some people in the group had a Manta swim under them, but not everyone was able to see it for the few seconds it appeared near us. Another boat was moored in the area, and Mantas could be observed around that boat from a different company while our boat drove aimlessly around looking for a mooring anchor. The trip was stressful due to safety reasons and mostly spent on the boat.