This is the 11383rd most frequent Swedish word.
nedgrävd
Buried.
Here, 'nedgrävd' is the past participle form of the verb 'nedgräva' (to bury) and describes the treasure as being buried.
Skatten var noggrant nedgrävd i trädgården.
The treasure was carefully buried in the garden.
In this sentence, 'nedgrävd' acts as an adjective describing the cable's condition of being buried.
Kabeln är nedgrävd för att skydda den mot väderpåverkan.
The cable is buried to protect it from weather effects.
Here, 'nedgrävda' is the plural form of the past participle, modifying the noun 'rören' (the pipes) to indicate they are all buried.