Exobiology Extant Life Surveyor, (also called EELS)[1] is a snakebot vehicle originally designed to explore the surface and the oceans of Enceladus, a moon of Saturn.

[2] The JPL has also referred to the possibility of using EELS to explore locations such as lunar lava tubes,[1][3] Mars's polar caps, and Earth's ice sheets.

[4][5] It uses multiple segments containing actuation, propulsion, power and, communication electronics.

[5] As of 11 May 2023[update], the current version (1.0) weighs approximately 100 kg (220 lb), and is 4 m (13 ft) or 10 segments long.

EELS has no scientific instruments, uses stereo cameras and Lidar, and it uses a tether for power and communications.