A huge container ship docked in Timaru had a liquid nitrogen leak with ice forming at the rear of the boat, but emergency services were unable to board because of the risk of Covid-19 among the crew.
The 280-metre Rio Blanco leaked two tonnes of liquid nitrogen around 3pm today, but the situation was now under control.
Fire and Emergency senior communicator Mau Barbara said 20 firefighters and other emergency services were at the port.
"We have the problem that there is possible Covid on board so we couldn't get on board and the crews couldn't get off," Barbara said.
They liaised with Customs and the ship captain to board the ship with two metre distancing wearing gloves and masks.