While relatively small quantities of water appear to be colorless, water's tint becomes a deeper blue as the thickness of the observed sample increases. The blue hue of water is an intrinsic property and is caused by selective absorption and scattering of white light. Impurities dissolved or suspended in water may give water different colored appearances.
The Minerva Reefs (Tongan: Ongo Teleki), briefly de-facto independent in 1972 as the Republic of Minerva, are a group of two submerged atolls located in the Pacific Ocean south of Fiji and Tonga. The reefs were named after the whaleship Minerva, was wrecked on what became known as South Minerva after setting out from Sydney in 1829. Many other ships would follow, for example the Strathcona, which was sailing north soon after completion in Auckland in 1914. In both cases most of the crew saved themselves in whaleboats or rafts and reached the Lau Islands in Fiji. Of some other ships, however, no survivors are known.