Read the following article and select the best answer. Article: Scientists from the United States say they have found fish and other creatures living under key waters in Antarctica. They made the announcement after completing three months of research at the Ross Ice Shelf, the world's largest floating ice sheet. The researchers hoped to find clues to explain the force of the melting ice and its effect on sea level rise. Reed Scherer and Ross Powell are with Northern Illinois University in DeKalb, Illinois. They just finished up their research on our southernmost continent. Money for the project came from America's National Science Foundation. "We chose a study site where, in the first year ,We went into the subglacial lake and tried to understand the environment in there, both ecologically and in terms of the ice dynamics about how the lake operates ,and how the sediment underneath the ice sheet operates, as well, because it's the water and the sediment underneath the ice that controls how fast the ice is flowing into the ocean" says Ross Powell, who led the investigation. The team included scientists ,engineers, machinery and other supplies across the ice from the main U.S. scientific base at Mc Murdo Station to the researcher's camp .The camp was near a subglacial lake ,where an earlier study took place, Ross Powell says the latest study may provide evidence that can help predict the effect of climate change on rising sea levels. "What we have found is that these are very sensitive areas to the stability of how dynamic the ice is and how fast the ice may react to increases of melting both from the ocean and the atmosphere." Among the new instruments built for the project was a powerful hot water drill. The researchers used the drill to dig down some 740 meters. They collected water ,sediment and other material from the grounding zone. Working around the clock before the deep hole refroze, they sent a video camera down to the 400-square-meter undersea area. Reed Scherer says the video images they saw in the Command Center were a total surprise. "It's a very mobile... Question: What made the researchers surprised when they saw the video images? - Researchers saw fish in the farthest south for the first time. - A video camera was able to work well under deep icy waters. - Sediment cores present differences in the history of the ice sheet. - The drill should dig down 740 meters to collect things.
A:
Researchers saw fish in the farthest south for the first time.