The men persisted in digging for the treasure at Oak Island due to finding a message indicating its buried location, encountering water filling the holes they dug, and discovering something hard when probing the sand.
The men kept digging for the treasure at Oak Island because they found a message that told them treasure was buried there. This discovery motivated them to continue their search. Additionally, each time they dug a hole, water would quickly fill it back in, indicating a potential hidden mechanism protecting the treasure and intriguing them further. Furthermore, when they pushed a bar into the sand, they discovered something hard, hinting at the existence of valuable objects below the surface.
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