Robotic Planetary Explorer (EELS)

Enceladas Mission: Latest evidence in 2017 shows possible water plumes on Europa and confirmed plumes on Enceladus. Plumes indicate a water vapor driven model, and requires temperatures around 273 Kelvin that offer a potential habitable zone for alien life near the surface, and access to liquid within 100’s of meters up to 2 kilometers of the surface. At these shorter distances, a robot mobility architecture to explore these sites would be feasible and be of high value. The robot would need to be able to snake into tortuous channels no more than 20cm in thickness, perch, take samples, and return up to the surface for further testing and discovery of alien lifeforms.

Earth Oceans: More than eighty percent of our ocean is unmapped, unobserved, and unexplored. Deep exploration of our oceans, networks of caves and trenches in the deep ocean floor, can help explain the origins of life on Earth, to how water arrived on Earth in the first place.

EELS Snake Robot: We are building snake-like robot platforms for entering deep Earth Oceans and Enceledas to explore these similar, austere environments. Our focus on a new locomotion platform, new control paradigms, will hopefully enable scientists to reach new depths that they have never reached before. Our platform, ARCSnake, was an inspiration for the JPL EELS mission.

This project is in direct collaboration with the Caltech-NASA Jet Propulsion Laboratory (Robotic Vehicles and Manipulators Group).



  • Florian Richter
  • Elizabeth Peiros
  • Jason Lim
  • Calvin Joyce
  • Sara Wickenheiser
  • Roger Nguyen
  • Mandy Cheung
  • Anne-Marie
  • Yaohui Chen



Tracking Snake-like Robots in the Wild Using Only a Single Camera


IEEE Conference on Robotics and Automation (ICRA) (2024)
Jingpei Lu, Florian Richter, Shan Lin, Michael C Yip

Mobility Analysis of Screw-Based Locomotion and Propulsion in Various Media


IEEE International Conference on Robotics and Automation (ICRA) (2023)
Jason Lim, Calvin Joyce, Elizabeth Peiros, Mingwei Yeoh, Peter V Gavrilov, Sara G Wickenhiser, Dimitri A Schreiber, Florian Richter, Michael C Yip

NASU--Novel Actuating Screw Unit: Origami-inspired Screw-based Propulsion on Mobile Ground Robots


arXiv preprint arXiv:2310.00184 (2023)
Calvin Joyce, Jason Lim, Roger Nguyen, Michael Owens, Sara Wickenhiser, Elizabeth Peiros, Florian Richter, Michael C Yip

Exobiology Extant Life Surveyor (EELS)


Pasadena, CA: Jet Propulsion Laboratory, National Aeronautics and Space Administration (2021)
Hamid Marvi, Michael Yip, Brian Wilcox, Ara Kourchians, Rohan Thakker, Nikola Georgiev, Jay Jasper, Sarah Hovsepian, Karl Mitchell, Morgan Cable, Darwin Mick Justin Martia, Andrew Thoesen, Kalind Carpenter

Arcsnake: Reconfigurable snakelike robot with archimedean screw propulsion for multidomain mobility


IEEE Transactions on Robotics (2021)
Florian Richter, Peter V Gavrilov, Hoi Man Lam, Amir Degani, Michael C Yip

ARCSnake: An Archimedes' screw-propelled, reconfigurable serpentine robot for complex environments


IEEE International Conference on Robotics and Automation (ICRA) (2020)
Dimitri A Schreiber, Florian Richter, Andrew Bilan, Peter V Gavrilov, Hoi Man Lam, Casey H Price, Kalind C Carpenter, Michael C Yip