It's just as if you've entered another world. This is unusual. Normally I have to cope with the boffins who get top marks in their theory but can't put their equipment together, or the slow learners who don't understand the theory but swim like fishes. Esther was both. She also has no fear.
Most people are apprehensive when they take their first open-water dive.
Esther was very confident. Esther has to be all of these in her chosen profession. You have to be quick-thinking and ready for anything. Scuba-diving seems very relaxing in comparison. Esther's only complaint is her weightbelt, necessary to overcome the buoyancy of a suit.