In it he pointed out that the Young Adventurers had undertaken the work at their own risk, and had been fully warned of the dangers.
The Young Adventurers seriously underestimated how dangerous it would be.
mnli hypothesis: The Young Adventurers seriously underestimated how dangerous it would be. premise: In it he pointed out that the Young Adventurers had undertaken the work at their own risk, and had been fully warned of the dangers.