Cod Rock is a lesser-known Bicheno shore dive from the end of Murray Street, recorded in the Marine Life Network guide to east coast diving. It rates it 5.5 out of 10: a colourful dive with zoanthids and a variety of seaweed beds, reaching 5-15 m, but one whose entry and exit become dangerous in rough seas because it is heavily exposed to easterly weather.

The reef is typical Bicheno granite, with boulders and gutters covered in brown algae and kelp in the shallows and zoanthids and sponges on shaded faces deeper down. Small to medium crayfish shelter in the cracks. Fish life includes the usual east coast species: wrasse, leatherjackets, banded morwong and schools of juvenile fish in the weed.

Cod Rock's value is as an alternative to the busy Waubs Bay area for divers who have their own gear and want a different shore dive. It is not as rich as the Governor Island sites or as easy as Waubs Bay, and it is only practical on genuinely calm days.

Documentation of this site is thin and dates from an older regional guide, so conditions and access should be checked on the day. Divers should also take note that it lies outside the Governor Island Marine Reserve, so normal fishing rules apply and line-fishers may be present on the rocks. Carrying a knife or line cutter is sensible for the same reason, and a surface marker helps boats heading in and out of the Gulch see divers on the way back.

Bicheno is on the Tasman Highway, about 2 hr from Launceston and 2 hr 15 min from Hobart. Drive to the seaward end of Murray Street in the town and park on the street. Carry gear a short distance across the foreshore to the rocks and choose a sheltered gutter for entry; check the exit before going in, because the rocks are hard to climb out on in any swell.

The site is exposed to the open sea, so a calm day is essential.

Cod Rock is heavily exposed to easterly weather and swell; the Marine Life Network guide warns that entry and exit are dangerous in rough seas. Dive only in westerly or north-westerly winds with swell under about 1 m, and avoid it after several days of easterlies when the water is also stirred up. Southerly swell wraps in to a lesser degree.

Visibility is poor for a day or two after heavy rain.

Enter at the sheltered gutter, descend to 5-8 m and follow the reef out towards 12-15 m, keeping the shoreline on one side for navigation. Turn at a third of gas to allow for a harder exit, and return along the reef to the entry point.

No regular operator. Occasionally shore-dived by visiting clubs (Tas Uni Dive Club, TSDC, Leven Scuba Club) during Bicheno weekends; the Bicheno Dive Centre that once guided local shore dives is reported closed.