Are you interested in the application of systems and complexity theory in Ocean and Earth sciences? Involved in Earth system modelling and in need of friendly discussion and advice? Want to pay homage to an ancient water god capable of fiery destruction in an informal and caffeinated atmosphere? Then the CTHULHU discussion group is for you! We are a newly set up informal group based at NOCS who plan to come together for occasional discussions, talks and coffee drinking sessions in order to share ideas and advice in all things Earth Systems. We hope that through CTHULHU that we can help each other in research relating to complex systems in Earth & Ocean science, and have a good time whilst we're at it. All students and staff are welcome to join in, and we also hope to help increase 'interdepartmental synergy' between NOCS, the Institute for Complexity Systems Simulations (ICSS) at Highfield and with any other students & staff interested across the University (and beyond).