Although about 80% of our planet is covered with water, people investigated only 5% of undersea world. Vast deeps such as oceans and seas and even lakes and rivers have always attracted and equally scared our ancestors. Their bottoms covered with various and often mysterious stuff generated curiosity and fright, created panic and wakened hopes, sparked rumors and fired people with enthusiasm to strike on truth.
Ever since humanity had started exploring mysterious underwater world, discoveries increased not only in numbers but in their extravagance. While some of those findings are pretty antique, others only a few decades old. Nevertheless, most of them represent distinctive artifacts treasured by humankind for their unique cultural heritage.