Have their best lead yet tonight. Three pulse signals, or what wate call acoustic events, were detected underwater this weekend. Chinese searchers discovered two of them a thousand miles northwest of perth. About 300 miles away, an australian ship found another signal. The hope they may be from the black boxes. We begin with seth doane in beijing. Reporter the h. M. S. Echo will use sophisticated listening equipment to try to verify thosher those electronic pulses were coming from the missing jetliners black boxes. The chinese vessel that reported detecting those pulses on friday and saturday is working in water nearly 15,000 feet deep. Angus houston, who is coordinating the search, warned that there are lots of noises in ree ocean. Were dealing with very deep dter. Were dealing with an environment where sometimes you can get false indications. Reporter the separate signals picked up today were 300 nautical miles away, detected by a pinger locator onboard this australian ship, the ocea