Dream About Pool Swimming And Cave Trap

My dad dropped me off at a poolside, it was a caramel colour area, the pool was only 5 ft deep so I decided to swim because I already knew swimming. I swam,but after a while I felt like the pool was bottomless, and a cave trapped me, pulling me in deep and i passed out. When I regained consciousness, they told my I lost control over my mobility and there were no caves Then scene shifted to my dad's friends house, and my dad's friend's mother told him there's space for a pool there. So I was teaching my sister swimming. This pool was actually 12 feet deep and everytime I tell her to float she sinks. I demonstrate it to her but she still sinks, so I have to pull her out by the hair