SINGAPORE - Otto Marine, a Singapore-listed offshore marine company, said on Tuesday it has secured charter contracts with two oil majors worth A$57 million (S$66.3 million).

The company will charter out two of its deep water anchor handling tug supply vessels, GO Sirius and GO Spica, it said.

GO Spica will be deployed to Australia for a long-term charter off the country's northwest coast this month. It will be operated by Otto Marine's wholly-owned subsidiary Go Marine Group.

Go Sirius will work out of Darwin, the company added. The vessel has been operating in Australia for the last two years and has "obtained a very good track record with multiple clients in achieving almost seamless back-to-back contracts in supporting drilling and construction projects."