ASKER, NORWAY (6 April 2011) - TGS announces that it has signed a Letter of Intent with Dolphin Geophysical AS to charter the M/V Polar Duke for 3D multi-client projects in Europe during the 2011 summer season.  The charter will begin in May 2011 and will last for a minimum of 3 months.  The agreement also provides an option for TGS to extend the charter in two increments (2 + 6 months) under fixed commercial terms.

The details of the individual projects to be completed under this charter will be announced separately.