Hi Innerchild , you have been a big inspiration for my research here and over the last months ive compiled information about the ocean & weather to try to help figure out the JC car mystery . This evidence is fairly compelling. I dont expect everyone to understand the information here about wave climate but i can post more specified info and detail the dates 20-22 further. Here is some evidence that shows a large wave event at cottesloe beach that supports the theory that the car went off the groyne & waves battered it before it was seen / found by a swimmer . Quote from *researcher; " it was a stormy period ! i think currents definitely would have been north to south and big waves too" Initial reply from Physical oceanographer . Wind directions from 15th june to 26th june 1988 . http://cloud.tapatalk.com/s/59244c7143a3f/ECMWF_wind_pressure_june_15-26_1988-2 (1).pdf wind direction and strength on the days 15-26 june . And more; "the wave model data for that time period ; 2 big swell events , up to 7 m at Cape Naturaliste (blue) and 6 m at Rottnest Island (white). red is cottesloe, but that is not properly resolved in the model. Green is Albany. Swell was quite west as expected, around 250 degrees. peak Periods between 12 and 17 seconds (1/frequency)" Quote oceanographer * Cottesloe beach geographical location is exposed to swells from this direction ie ; Swell angle of northwest : Quote from physical oceanographer On the swells direction : " around 287.5, degrees then jumps/spikes to 319 and 343 degrees or so ." Quote. Wave data showing large wave heights 4metres on the 20th . Extremely large wave heights shown on graph - dates are at the bottom of page . I think the car could have been hidden beneath the waves, in the murky dirty colored water with waves breaking . the water could remain murky inshore for a few days after the swell event . This also provides evidence of how the car could be smashed, against the groyne repeatedly for hours perhaps. all from the waves power . Also of note ; It was stormy wild wet winter weather conditions before the 21st and after the 23rd which must have made searching very difficult . Not suprisingly the car was found during the (only) finest day of all the period 15th-28th june 1988. These are some of the sources of this information. This is the source of *researchers information. http://www.ecmwf.int/en/research/climate-reanalysis/era-interim * Doctor of Physical Oceanography . https://en.m.wikipedia.org/wiki/Physical_oceanography http://cloud.tapatalk.com/s/591c6c0...urnal_of_the_Royal_Meteorological_Society.pdf Photo showing rocks and reef in close proximity to groyne that could cause the battered car if it was dumped off the groyne Second paragraph: "The roof of the medium size vehicle, a Fiat 123 (some model number) about 14? years old, had been caved in by being pounded against rocks on Cottesloe groyne." .