SEATTLE — Keen observers may have spotted a particularly large vessel making its way through Puget Sound early Friday as the MSC Virgo completed the last few miles of its nearly 30-day journey from South Korea to Seattle.

According to the Northwest Seaport Alliance, the vessel is the largest container ship to ever call at Seattle’s recently overhauled Terminal 5. The first phase of the $300 million modernization project was completed in January after port officials approved a slate of improvements to help Puget Sound keep up with growing cargo volumes and increasingly large ships.

Built in 2020, the MSC Virgo sails under the Portuguese flag and is operated by the Mediterranean Shipping Company, a Swiss international shipping line. The ship is a 15,000 TEU vessel, meaning it’s equipped to carry up to 15,000 20-foot shipping containers. According to MarineTraffic, the MSC Virgo is roughly 1,200 feet long.

The ship is the second large vessel to call at Terminal 5, following the MSC Margrit’s arrival last week. Port officials said the modernized terminal’s new dock configuration and deep-water berth allows it to handle the largest ships in the Transpacific trade.

“The NWSA is proud to welcome a series of ultra-large container vessels to Terminal 5,” the Northwest Seaport Alliance said in a news release. “These ships utilize Terminal 5’s on-dock rail system which moves containers more efficiently from the terminal to the final destination. Terminal 5 is increasing access to goods for businesses, expanding job opportunities across [Puget Sound], and supporting export opportunities for Washington state and Midwest agricultural producers.”