Saw an unidentified seemingly intelligent white orb or object moving along the surface and under water while camping at Pine Flat Lake.

I was camping by myself at Trimmer campground on Pine Flat Lake in the Sierra Nevadas.  I woke up at 1 A.M after falling asleep in my car to warm up.  When I woke up I looked down at the lake and saw a very bright white light shining bright sitting right on top of the water on the edge closest to me.  I reached for my phone which showed it was at 6% and I brought it up to take a video and it died immediately.  I didn't want to scare it away by starting the car to charge my phone, so I watched without taking my eyes off of the object for about an hour.  It was very bright, white when I first saw it and over some time it dimmed down at times going underwater and moving around.  When it went underwater I could still see the light smaller and less bright underwater moving.  Eventually, I thought it had disappeared and I had to get out to use the restroom.  
As I opened the door, I kept my eyes on the lake.  It reappeared very bright, right when I opened the door. Then it! dimmed and shot under water and further away.  I used the restroom got back in the car and continued to watch the seemingly intelligent orb or unidentified object reacting to the noise I had made.  On the right side of the lake, there were two blinking lights signaling boaters to avoid something floating in the water.  The unidentified light lined up next to the flashing lights and started flashing, as though mimicking the flashing lights.  It then traveled mostly underwater, at times peaking up further away until I could not see it anymore.