While in New York, Bardem also appeared in to New York's Times Square to spread the message of oceans conservation as he called on world leaders at the United Nations to create a treaty to protect 30 percent of the world's oceans by 2030.
He said his trips with Greenpeace to Antarctica have inspired him.
In 2018, the Oscar-winner took part in an eight-day-long Arctic ship tour along scientists and campaigners in support of the Greenpeace "Protect the Antarctic" campaign.
During that visit Bardem had the chance to travel in a mini-submarine to the depth of 270 meters on the seafloor, an experience he said made him feel like he had traveled back to prehistoric times.
According to Greenpeace, the sanctuary is needed to put the area off limits to the krill fishing industry which is looking to expand into the area.
Krill is a keystone species in the Antarctic ecosystem - most wildlife is either directly or indirectly dependent on it, including penguins, whales and seals.