Thalassa Holdings Limited (Thalassa) is a holding company. It is an international business company (IBC) with operations from geophysical project management and services. It has a number of operating subsidiaries in the Energy Services Industry, focused on marine geophysical services. The Company was established as a holding company that has two subsidiaries, WGP Exploration Limited (WGP) and WGP Energy Services Ltd., formerly Thalassa Energy Services Ltd. WGP Energy Services Ltd. was established to acquire marine seismic equipment, a Portable Modular Source System (PMSS). The equipment can be installed on a vessel in order to provide the seismic (sound) source to allow exploration and production companies to perform reservoir monitoring. WGP delivers a range of technologies and services throughout the global upstream oil and gas industry, including a range of seismic acquisition services. On November 16, 2011, it acquired WGP.