( CNN ) -- Imagine searching the country of Belgium for three pieces of metal , the largest about the size of half a tennis court -- a moving tennis court . That 's the reality for searchers in the south Indian Ocean as they look for two objects , a satellite find that Australian officials call the strongest lead in the search for Malaysia Airlines Flight 370 and its 239 passengers . A third object was spotted by a Chinese satellite on March 18 and made public Saturday . The objects are drifting in one of the most inaccessible places on Earth , giving search planes only about two hours before they have to return to Australia . Ships from several countries are assisting in the search , but have n't turned up anything . And conditions are n't helping . Massive waves , high winds and currents could push the three objects farther east and farther apart , according to a NASA simulation . Below the water 's surface lies an even murkier search climate with the sea floor 9,000 feet down and deeper than most submarines can go . A mid-ocean ridge in the area has peaks and valleys like the Rocky Mountains . That could meet pinpointing the site of possible wreckage harder still . The latest questions and answers . Listening for fading pings .
Three debris pieces are spotted in an area the size of Belgium . Search area in south Indian Ocean is one of the least accessible places on Earth . Currents , waves and wind cause debris to drift . Ocean floor is deeper than most submarines can go .