Workers at Inpex’s Ichthys liquefied natural gas export project in Australia have started strikes after talks between union members and the company stalled.

Protected Industrial Action commenced on all three Inpex facilities with work stoppages and bans, despite “significant progress” made during talks last week, The Offshore Alliance said in a social media post. Workers will down tools for four hours a day, as well as other measures, the union group said by email.

Ichthys accounts for about 2% of global output, and has the capacity to export around 9.3 million tons a year, mainly to Japan. The strike stands to have an outsized impact on the market — LNG supply is down about a fifth after Qatar halted production, while the Strait of Hormuz remains largely closed.

“The response from Inpex has been underwhelming and shows that the company is not taking the negotiations seriously,” Offshore Alliance said in an email. “Offshore Alliance members feel that the company is now playing games and as a result will commence industrial action.”

The union is seeking pay rises and better conditions for workers at both the Ichthys offshore gas field and onshore plant. Talks with Tokyo-based Inpex have been underway for more than a year without resolution, the union has previously said.

As part of the strike action, union members will down tools between 6 a.m. and 8 a.m. and 6 p.m. and 8 p.m. They will also not work past 6 a.m. on “demobilization day,” or swap between day and night shift without at least four weeks notice, according to the statement.

Offshore Alliance said it plans to serve another notice setting out industrial action for June 11 to 23.