Blocked drains are no fun. I remember one Saturday night when I was upp to my ankles in bath water in my apartment bathroom, and didn't know what to do or who to call. Having worked with plumbers in the renovation business I had picked up a thing or two about drains. I looked for a plug under the floor and found it. Someone had shown me this at some point and luckily I remembered it. I prised the plug out of its hole and shoved the shower hose into it. Then I turned the water on full blast and managed to flush the drain.