Sping of Piera
2 Loot Treasures | Ancient Tablet | 1 Ainigmata Ostraka
Treasure 1 is outside, but underwater.
The Ancient Tablet is outside, next to the statue
For the rest there is an entrance to a cave (see big map). It's up in the rocky wall.
There's a pool inside. Dive all the way through to the big air filled area. Follow the blue plants. Here's Treasure 2
Now, there is another path from here that is not filled with water. Take it.
You will get to a cave area with roots hanging down and a pit.