This video taken by a diving instructor in Thailand showcases the sea snake, known as a banded sea krait, in its element: swallowing a moray eel as big as it is.

The instructor saw the scene unfolding and began capturing the video, which begins with the sea snake mid-meal, sliding the eel down its throat bit by bit. The eel’s muscles spasm at one point, as though it is trying to fight—it doesn’t seem to enjoy being ingested. But the snake had eaten a good portion of the eel already, so resistance was futile.

The banded sea krait’s habitat includes shallow, tropical waters of coral reefs and mangrove swamps in the eastern Indian and western Pacific oceans. They