To make sure he had conquered fear, Douglas went to Lake Wentworth in New Hampshire Dived in and swan two miles across the lake to Stamp Act Island. Only once when he was in the middle of the lake, did the terror return. But he confronted it and swam on. He then swam across Warm Lake to the other shore and back .

How did Douglas make sure that he could swim anywhere?

The instructor trained Douglas piece by piece and built him a fearless swimmer. He told him that he could swim, dive off and crawl stroke. The instructor was convinced that Douglas was free from terror but the latter feared lest the old terror should return back to him when he would go alone in the water.

Why was Douglas determined to get over his fear of water How did he make sure that he conquered the old terror?

After his misadventure in the pool, Douglas wanted to get into the waters of the cascades but the old fear overpowered him. His legs would become paralysed and icy terror would grab his heart. ... So he decided to was keen get over his fear of water by engaging an instructor.