ninja art of water-escape
A fictional or historical ninja technique for escaping using water; often appears in popular culture and ninja stories.
The ninja vanished into the river using the art of water-escape.
Compound of 水遁 (suiton, 'water escape') + の (no, possessive particle) + 術 (jutsu, 'technique'). 水遁 itself is a Sino-Japanese term from Chinese elements meaning 'water' and 'escape/concealment'.