Linered or concrete style changes are relatively similar.
Linered. Remove liner, cut with a diamond blade the bottom leading to the deep end. Break the entire bottom into pieces. Dirty fill it leaving gravel on the top couple inches. Pour surface. Measure again for liner to bead (triangulation measuring is recommended A/B). If the bottom is to be a sport pool you may want to remove the entire bottom and dig it out a foot then pitch the wall 12/12 to the depth desired.
Concrete; similar except you need to bond the bottom sections so they dont split away with metal rods drilled in it as binders. Obviously etch the original concrete surfaces with muriatic acid so the new pour adheres. Bottoms on many concrete pools are poured after the walls in my experience retrofitting. If they are built otherwise you may need somebody else to advise you. This type of pool is rarely dropped an additional foot across its length and instead done as two tiers; one for children and another for adults with a net in between for volley ball, etc.
If you have more specific questions; feel free.
swimming you have to go in a pool where as diving you dive into water from a height
Swimming races and diving
A pool. Water. A swimsuit. Time
diving into a swimming pool is not hard because water moves and ice is hard and you will heart your self if u try to jump in ice
Length of the perimeter and the depth. Is it a diving pool?
6-10 grand to raise the deep end and resurface the pool. More if you want other stuff done.
at your local swimming pool or a place where they have swimmeats
restate your question it does not make sense.
UM. In a swimming pool.
The Diving well in a pool should be at least 10 feet or deeper. For safer situations I would go with at least 12 feet.
No pooping in pool, no running around pool, and no diving depending on how deep it is.
I can say for certain that they do, I was bitten by one today in my swimming pool!