According to TibiaFandom:
Every day that the dungeon is open a certain number of Deepling Scouts must be killed, otherwise they will flood the whole dungeon again so you need to drain all the water anew if you want to gain access to the hunting ground and the steamship link.
Do you know how many Deepling Scouts I have to kill after the first server message to avoid dungeons being flooded and delivering 200 nuggets of coal to Dronk?