This is a great dive at Bass Point, there are large 15mtr or so high walls everywhere here. There are two main things to checkout here, the Arch itself which is a large arch (funny that) with a sandy bottom that curves around to the right and upwards. There is some growth to be found on the roof and walls if you look.
If you swim south and go up and over the arch you will eventually come to another wall that runs East-West, drop down and head West towards the shore and in the corner where the wall turns and heads South you will find a largish cave to checkout as well. You can also spot Giant Cuttlefish in this area as well as lobster.