when the sea rises ...

the sea and the boat are animated. the waves are 5 meters

Use of layers is explained in the manual : text window to the right in the .blend file
in brief :

+ 1 et 2 : the boat
+ 6 : sky
+ 11 : Dynamic Ocean
+ 12 : passive Ocean : extension (not greedy in resource) of "dynamic ocean"
+ 13 : reduces Ocean (for sketchfab) (use requires changing textures of the sea. see manual)
+ 20 : static ocean (variant) (requires the timeline position 0 )