For ancient travelers the sea represented real physical danger, while biblical imagery also used turbulent waters for chaos and powers beyond human control.
Jesus does not perform a ritual or appeal to another human authority. His direct word brings immediate calm.
Psalm 107 describes endangered sailors crying to the LORD, who stills the storm and hushes the waves. Psalms 65 and 89 likewise praise God's unique rule over roaring seas.
The story also resembles Jonah in important ways, but with a decisive contrast: in Jonah the LORD stills the sea; in Mark Jesus himself commands it.
Awakened during the storm, Jesus rebukes the wind and says to the sea, 'Peace, be still.' A great calm follows.
Mark ends with the disciples' fearful question, 'Who then is this, that even the wind and the sea obey him?' The narrative itself invites the reader to answer from Israel's Scriptures.
Miracle-working alone does not establish deity, since prophets also perform miracles. The distinctive force here is the scriptural pattern and Jesus' direct sovereign command.
Mark's identity question and Old Testament sea imagery make this a strong divine-identity episode.
The disciples become greatly afraid and ask who Jesus is, since wind and sea obey him.