The sword net had holes in it. No matter how formidable and dense the thread-like sword wills were, the net could in no way block all the seawater.
The pouring seawater was not as torrential as before, but it was still dripping, acting like a damp towel from which the water can always come out so long as it is tightened enough.
The next thing they needed to do was to place stones, dirt and sand on the invisible sword net the area of ten square miles, and to use the formations and amulets to connect all the stones, dirt and sand as a whole. It was tantamount to constructing a crust at the bottom of the Huge Whirlpool.