low tide

The study is intended to help researchers understand how the manmade breakwater that was built in the 1930s in Santa Monica Bay, often visible during low tide, might hurt water circulation and, therefore, water quality.

What was once Great Britain is now a quarantined island, cut off from the mainland and protected by an armed causeway that can only be accessed during low tide.

He's only ever known a feudal life in this 150-strong sanctuary, connected to the quarantined mainland by a single, heavily defended causeway that's only accessible at low tide.

At low tide, the sea is not visible beyond the expanse of grassland, but the area is littered with driftwood, some plastic waste and there is even a small, upturned boat nearby.

At low tide, however, there is nothing preventing anyone walking over to the heavily corroded, sea-worn hulks of metal that once formed the SS Vina - despite it being extremely perilous to do so.