Hanwha Ocean has secured an order worth approximately $500 million to construct four very large ammonia carriers (VLACs) for Greek shipping company Naftomar Shipping and Trading Co. Ltd. Inc (Naftomar). Each VLAC will be able to transport 93,000 cubic meters (cbm) of ammonia, a carbon-free fuel, making them the largest vessel of their class in the world, Hanwha Ocean.