The Corinth Canal is a canal that cuts through the Isthmus of Corinth, connecting the Gulf of Corinth with the Saronic Gulf in the Aegean Sea. It separates the Peloponnesian peninsula from the Greek mainland. The canal was built between 1881 and 1893, and it is 6.3 kilometers long and 21 meters wide. It is one of the deepest canals in the world, with a minimum depth of 8 meters.

The Corinth Canal saves ships a 700-kilometer journey around the Peloponnese. However, it is too narrow for modern ocean freighters, as it can only accommodate ships of a width of up to 16.5 meters and a draught of 7.3 meters.

There are two submersible bridges across the Corinth Canal, one at each end, in Isthmia and Corinth. They lower the center span to 8 meters below water level when they give way to ships crossing the channel. The bridges are 24 meters long and 11 meter wide. The bridges were built in 1962 and 1964. They are operated by the Greek Ministry of Shipping.

The submersible bridge’s primary advantage over the similar lift bridge is that there is no structure above the shipping channel and thus no height limitation on ship traffic. This is particularly important for sailing vessels. Additionally, the lack of an above-deck structure is considered aesthetically pleasing, a similarity shared with the Chicago-style bascule bridge and the table bridge. However, the presence of the submerged bridge structure limits the draft of vessels in the waterway.

The submersible bridges are a unique and important part of the Corinth Canal. They allow ships to pass through the canal without having to wait for the bridges to be raised. This saves time and money for shipping companies.

The submersible bridges are also a popular tourist attraction. Visitors can watch the bridges being lowered and raised, and they can even take a boat ride through the canal.

According to Wikipedia