Is there really any miraculous event here?
The disciples get into a boat and wait for Jesus to join them.
The wind gets up so they have difficulty keeping the boat in place.
Eventually Jesus appears, wades out and tows them back to land,
which is where they meant to be in the first place.
It would seem that a mountain has been made
out of a marine mole-hill.
The tendency of charismatic speakers, even today,
to add a spiritual component into a natural situation
perverts the story from credibility into propoganda
to the detriment of Christian credibility.
From this has grown present doctrine
and the demise of the church
which promotes it.