Multi Client Data Sales Update

10 October 2016

Thalassa Holdings Ltd

(Reuters: THAL.L, Bloomberg: THAL:LN)

("Thalassa" or the "Company")

Multi Client Data Sales Update

The Board of Thalassa is pleased to announce that WGP Survey Ltd, a wholly owned subsidiary of WGP Group Ltd ("WGP"), has made further sales of the multi client data acquired with TGS-NOPEC Geophysical Company ASA in 2014. These sales will generate approximately USD$2 million in additional gross revenue prior to allocation amongst the multi client partners.

Duncan Soukup, Chairman of Thalassa, said: "These data sales are extremely welcomed and we expect to be able to issue a trading update in the coming weeks, which will also reflect the completion of the current acquisition programmes in the North Sea."

Investor Enquiries:

Thalassa Holdings Ltd

Duncan Soukup, Chairman +33 (0)6 78 63 26 89

WH Ireland Limited (Nominated Adviser and Broker)

Chris Fielding, Head of Corporate Finance +44 (0)207 220 1650

Press Enquiries:

Square1 Consulting (Public Relations)

David Bick +44 (0)207 929 5599

www.thalassaholdingsltd.com

Note to Editors:

Thalassa Holdings Ltd, incorporated and registered in the BVI and quoted on AIM, is a holding company with subsidiaries in the Energy Services and Defence and Homeland Security Industries, with a current focus on marine seismic operations.