Above and through the Times Online there are videos which show the eruption of the West Mata volcano. The volcano is 120 miles (200 kilometres) southwest of the Samoas and 4,000 feet (1,200 metres) below water.
The video is historic in the sense it is the first filmed start of a eruption of a submarine volcano and also because it shows a eruption on the seafloor and not on some peak.
Besides its overall "cool" factor the eruption shows how crust is reformed. The very process shown has been repeated for millions/billions of years and been a driving force in the shaping of the earth and the movement of continents.