The dragon's rage put the water in turmoil, which made it a struggle for Han Sen to stay on course. Right now, he was attempting to dive towards the rocks to which the dragon's chains were anchored.
After diving down to a depth of one hundred meters, he still couldn't see the bottom of the lake, but he did see where the chains led.
The chains were there, screwed deep into the lake wall. This was slightly disappointing for him.
Han Sen had expected there to be a simple lock he could break, but perhaps behind the wall, there'd be something else.
With Taia in hand, Han Sen began to strike the stone. But the rock was tough, and it was difficult for him to make progress quickly.
After a while of trying to cut through, he decided to give up. Stabbing the sword into the rock left only light marks on its surface.