John 6:16-21 And when even was now come, his disciples went down unto the sea, And entered into a ship, and went over the sea toward Capernaum. And it was now dark, and Jesus was not come to them. And the sea arose by reason of a great wind that blew. So when they had rowed about five and twenty or thirty furlongs, they see Jesus walking on the sea, and drawing nigh unto the ship: and they were afraid. But he saith unto them, It is I; be not afraid. Then they willingly received him into the ship: and immediately the ship was at the land whither they went.
The disciples went over the sea toward Capernaum when it was getting dark, and Jesus was not with them. The sea became choppy and full of waves because of a great wind that was blowing.
When they rowed about 6 kilometres or halfway across, they saw Jesus walking on the sea. They perhaps thought Jesus would follow in a ship, but instead, He walked nearly 6 km on the water to help them in their new danger. He identified Himself to them by saying: ‘It is I; be not afraid.’
‘Immediately the ship was at the land’ – this is one of the greatest miracles of all – a whole ship taken from a storm in the middle of the sea was suddenly at the shore. It was no doubt carried by God’s power like Philip was carried physically through the air (Acts 8:39-40) about 40 kilometres to Azotus.