I went off to take a nap in my master's chair, thinkin' all my problems were solved. I had a nightmare about drownin' in the ocean... because I really was drowning!
See, the spell on the broom was so strong, that all the splinters and broken bits grew into brooms! And they all had the same mission in mind - carrying water inside! There were dozens and dozens and dozens and DOZENS of those guys filling up the whole tower with water.