While I suppose anything is possible, it is very highly unlikely and improbable. I have done swimming pool leak detection and repair on thousands of pools over many years and I have never seen a hole on the bottom of the deep end from a dog.
Yes it can be done
The adjective form is probable. Example sentence:It is probable I will see him tomorrow.The probable outcome will benefit our bottom line.
I had an inground pool installed. We just turned on the lights at night and noticed footprints on the bottom. Can this be fixed? Call the pool company back. The bottom is normally sand mixed with cement. The liner will probably have to be removed and bottom smoothed. They should have checked that before installing the liner. Those printswi catch sediment and debris for the life of the liner.
Vermiculite is not a suitable substrate.
Confuse question; probable you think to lanthanides.
Theoreticaly Yes
one of 3 things......worn laterals in the bottom of the sand filter, the sand might need changing which should be changed every 5 yrs ish or are you doing regular back washes..at least once a week.
the concrete should be 6" according to this site http://www.de-fontenay.com/poolcon4.htm
YES.
Yes, it would be possible to turn a regular bike into an exercise bike. The way that this is done, is by mounting the bike at a level where the wheels spin, but the bike does not move. You can do this by welding metal onto the bottom of the bike, and elevating it.
NO !
that is regular to have a pulse there.