in murky waters of an estuary off haggen berger road and the moon played a big role in that discovery. laura? >> let's set the screen a little bit here. the gun found this morning in conditions much like this. and there is another time of day it might be six feet deep a good place to hide something. but when tide goes out, as it is now, much of the bottom is exposed. >> there, lurking under murky waters in the canal less than than a mile from the university. police found the gun they believe one goh used nound res than a foot of water this morning. it contains same numbers when purchased this year, abc 7 news learned goh bought a gun in castro valley. the canal is shallow. water depth can fluctuate when the moon is full. >> interest is a watching moon. you're going see a big shift in ties. and there is a shallow body of water this is. >> evident. >> police believe the discovery after around the clock search that included 25 divers and sonar equipment from the coast guard. in the end there was a small team of investigators walking into the water with lights who found the gun. there are