This is the 5285th most frequent Russian word.
океана
The genitive singular or accusative plural form of "ocean" in Russian.
Here, "океана" is used in the genitive case to indicate possession or a characteristic of the noun "глубина" (depth).
Глубина океана впечатляет.
The depth of the ocean is impressive.
In this sentence, "океана" functions again in the genitive case to indicate connection or origin related to the word "мелодия" (melody).
Мелодия океана успокаивает.
The melody of the ocean is soothing.
Here, "океана" is used in the genitive case as the noun accompanying the direct object "видом" (view) to specify the origin of enjoyment.