When the probe arrived in the Saturnian system in 2004 , scientists hoped that hydrocarbon lakes or oceans might be seen in reflected sunlight from the surface , but no reflections were found . When the probe arrived in the Saturnian system in 2004 , it was hoped that hydrocarbon lakes or oceans might be detectable by reflected sunlight from the surface of any liquid bodies , but no specular reflections were initially observed .