There is a relay point between the Lower Spring Cave and the Spring Cave Depths. Spring Cave, Upper Spring Cave, Lower Spring Cave, and Spring Cave Depths have 4 floors each. A Kecleon Shop can appear on Spring Cave 3F.
The music for the area includes Magma Cavern and Magma Cavern Pit from the first Pokémon Mystery Dungeon games as well as a remix of Magma Cavern Pit in the Spring Cave Depths.
Despite the warnings given in the Special Episode about Sunflora's type disadvantage, not only are there no Fire-type Pokémon found in Spring Cave, but over a third of the Pokémon in this dungeon are weak against Grass-type moves.