Million Dollar Point, where the US military dumped trucks, forklifts, and jeeps into the ocean

Called Million Dollar Point after the millions of dollars worth of material disposed there, the dump is a popular diving destination, and divers report an amazing quantity of wreckage: jeeps, six-wheel drive trucks, bulldozers, semi-trailers, fork lifts, tractors

The dumped goods were not abandoned by the Vanuatu (then known as the New Hebrides), but by personnel of a WWII American military base named Buttons. At the end of the war, sometime between August 1945 and December 1947, the US military interred supplies, equipment, and vehicles under water.

The Seabees built a ramp running into the sea and every day Americans drove trucks, jeeps, ambulances, bulldozers, and tractors into the channel, locking the wheels and jumping free at the last second. Engine blocks cracked and hissed.

https://www.warhistoryonline.com/war-articles/ready-to-cry-amazing-images-of-the-war-dump-million-dollar-point.html