The largest ship ever built is the Seawise Giant, that measured 458 meters in length and weighed 657,019 tonnes when fully loaded.

The world's longest bridge-tunnel complex, the Hong Kong-Zhuhai-Macau Bridge, has a main section that spans 29.6 km over the open sea.

The USS Nautilus, the world's first nuclear-powered submarine, could stay submerged for up to 3 months without refueling.

The world's largest cruise ship, Symphony of the Seas, has a maximum capacity of 6,680 passengers and 2,200 crew members.

The Panama Canal, which opened in 1914, allows ships to bypass a treacherous 8000-mile journey around the southern tip of South America.

The RMS Titanic, which sank in 1912 after hitting an iceberg, was the largest ship afloat at the time.

The largest iceberg ever recorded was 168 miles long and 60 miles wide, roughly the size of Jamaica.

The ocean covers more than 70% of the earth's surface, and the deepest part of the ocean is the Challenger Deep, located in the Mariana Trench.

The longest non-stop solo sailing journey was completed by Dutch sailor Laura Dekker, who sailed around the world for 518 days.

The world's oldest commissioned naval vessel still afloat is the USS Constitution, launched in 1797.

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