Sept 16 (Reuters) - Siem Offshore Inc SIOFF.OL :
* CONTRACT EXTENSION FOR 3 X AHTS VESSELS OPERATING IN AUSTRALIA
* EXTENSION WILL SECURE WORK UNTIL OCTOBER 2021 FOR ALL 3 AHTS VESSELS WITH OPTIONS UNTIL END OF 2022
* AGREED WITH CHARTER TO EXTEND FIRM CONTRACT FOR 3 X LARGE AHTS VESSELS (ANCHOR HANDLING TUG SUPPLY VESSELS) OPERATING IN AUSTRALIA