Nicely done! You've got some great little tips in your video on how to work bedrock, and on how to know where to check.
Furthermore, I liked your tapping test too that helps with knowing loose bedrock from solid slabs. I've used that one myself many times and it really helps. On dry bedrock, you can also hit it with a big hammer and watch for puffs of dirt to fly up--that lets you know where cracks were that opened up enough to let things in during a past event, yet they may be snapped shut tight today, and not seem big enough at the present to have ever let anything in.