He is on The Down Treader, his ship. Pevensie siblings- Lucy & Edmund, their cousin- Eustachy and their friend- he didn’t know her name; appear in the sea. They just entered the Narnia.

Some of his people and he, jumped into the water

He swam to the girl that he didn’t meet when he last saw them. She wasn’t with them earlier

He wrapped his arms around her and caught the ship cord. A moment later they’re standing on the ship board

Welcome back my friends… He said to Lucy and Edmund