Drowning

I had a dream I was with my sister and I jumped into a pool and when I got to the bottom the water was too heavy and I couldn’t swim up no matter how hard I tried. I couldn’t breathe. In my dream i woke up in a tunnel like water slide/ pool like thing. I was with my sister again and i passed out in shallow water but my head was underwater and i was fighting to breathe once again. Finally in my dream I woke up and gasped for air. My sister apologized to me and I woke up in real life. Very odd.