Tell me a mistake so bad it made you quit?

I was in creative mode deleting my base for like the 3rd time. I got rid of everything.

Then I remembered that , last night I stored all 18 thyla babies and thier top tier parents in a container, which was on a platform I picked up.

The kicker was that I'd built it above water, so the drop bag is somewhere in a lake.

I defogged the water, removed the plants and I cannot find the brown bag (that looks so much like a rock) I had about 20 minutes until it decomposes and I spent 15 looking.

If anyone knows of any admin commands I can try with my final few minutes, please suggest them. Or tell me your own horror stories, because I am mad at myself.