That's some substantial damage there @Bluetooth. You might like to call the professionals in to take a look at it before you attempt any D.I.Y. repairs.
There's been quite a bit of moment in the structure, and some serious repairs will need to be carried out. The cracking in my pool is substantial, and it's nowhere near as bad as this. It's likely not just the tiles that have cracked. With that amount of movement, the pool's shell would almost definitely have cracked too. You'd need to remove the tiles and assess the structure. You'd then need to repair the cracks in the concrete shell and re-tile.
You might just need to create a feature of those areas and use a different tile for the repairs.