and tane saw hiro lower his giant net and drag it along the sea bed. he watched all day as the net was brought up again and again. eventually he cut his canoe loose and let himself float away until hiro's boat was over the horizon. he dived down to inspect the ocean floor but couldn't see very well...
seafloor rift is propelled by rising gas bubbles escaping from deep within our planet. and clearly this gas comes up as a froth, as is so typical of the magma we see ejected onto the surface of our planet. the high-pressure gassy rock froth tends to rise and build-up under the lithosphere, earth's hard shell...