strange dream

i was reaching out at something
appeared like some sort of opening/gap
cockroaches appeared
i withdrew my hand
i was afraid
more cockroaches appeared, crawling out
i reached out again hestitantly, trying to avoid the pest
roaches kept running around
then i saw water slowly flowing out from inside
the roaches seemed to be afraid of the water
the water spreaded, the roaches scurried away, avoiding the water
can someone explain what that means??