Your standard Yorke jetty, wooden pylons are covered in growth, mostly a sandy bottom under the jetty with seagrass either side. There is a sunken car at the end of the jetty, reportedly a Ford Telstar but this is hard to tell with all the growth on it. If you fancy a swim away from the jetty there is a wreck within scuba distance of the jetty called the Hougomont, if you swim from the end of the jetty to the south and ever so slightly East for 175 meters you will come across the wreck owing to the large anchor chain which stretches along the bottom for a fair distance. Most of the wreck has collapsed but there are still sections intact, a lot of fish call this their home.
The only real shore access to the water is via a ladder on the jetty, if you don't fancy climbing up and down with your gear on you should bring some rope and clips so you can lower and raise your gear from the jetty above. Shore access requires entry into Innes National Park which has entry fees these can be paid online before you leave or via your smartphone or by stopping into the visitors center once you arrive. The park may be shut on days of high fire danger or for other reasons so check in advance.