Divernet

WE BEGIN OUR SECOND CENTURY of Wreck Tours with the Iolanthe, an enjoyable but rarely dived wreck off the Dorset coast. Located a couple of miles further offshore from the popular wreck of the Aeolian Sky (Wreck Tour 27, May 2001), the Iolanthe is smaller, less intact and averages 15m deeper, so perhaps that has something to do with it.
The wreck has collapsed almost level with the seabed at 44-46m. Only the boilers, bow and stern rise 4m above the general wreckage. Our tour begins with a shotline dropped on the port boiler (1).
The Iolanthe is listed as having two boilers. The port boiler is still in place, but all I could find of the starboard unit are the mounting brackets (2).
There are not even any scraps of boiler plating in this area, so I suspect that the boiler has rolled well clear off the starboard side of the wreck.
Heading aft along the starboard side, a pair of boat derricks that would have stood on the boat deck above the engine-room have collapsed into the wreck (3).
The triple-expansion steam engine (4) has also collapsed, leaving some parts upright with the cylinder heads tilted downwards to port. On the port side, the boat derricks (5) are half upright, leaning in towards the engine.
The main deck aft is largely intact and has collapsed straight down in line with the wreck. The coaming from the first hold aft is three-quarters complete (6).
Between the holds, a pair of cargo winches are intact (7) and still fastened to the deck with the mast footings set between them.
Continuing aft, the last hold has an intact coaming, while off to the starboard side a small section of railing (8) still stands upright, providing a home for clusters of small plumose anemones.
The intact deck ends with a pair of ventilators, then there is a minimal break before the intact stern (9) rises above.
The stern itself has fallen to port, leaving the keel exposed with the rudder and propeller in place, though the uppermost blade of the propeller has broken. A slight scour makes this the deepest part of the wreck at 46m.
Following up the stern along the line of the rudder shaft, the steering quadrant and steering engine (10) stand above the stern, now almost parallel with the seabed. The Iolanthe is listed as having been fitted with a 12-pounder gun that would probably have been mounted here.
I searched out above the stern, but could find no sign of it.
Now heading forwards again, our route follows a quick swim along the port side of the wreck past a pair of bollards (11) and then on past the boat derricks (5) and boiler (1) before slowing to explore the forward part of the Iolanthe.
A broken winch (12) lies on the centre-line of the wreck, with the forward mast (13) just forward of this. The mast has fallen to port and is broken about halfway along its length. Just forward of the break in the mast is a short upright section of hull and then a bulkhead at right angles to it, with an intact railing across the top of the bulkhead (14). Held well clear of the seabed, this railing is particularly well decorated with anemones.
Located between the two forward holds, this is an unusual feature and evidence that the wreck is indeed the Iolanthe, as the vessel had a much-longer-than-usual boat deck extending forward past no 2 hold.
There would have been a railing across the front of the boat deck before it stepped down to the main deck and no 1 hold. Having said that, the wreck was positively identified with recovery of the bell in 1994.
Continuing forward again, deck features resume with a pair of ventilator bases (15), then more intact railing running along the wreck on the starboard side. A big anchor is secured to a deck plate roughly on the centre-line of the wreck, followed by another section of railing running across the wreck (16).
A pair of mooring bollards (17) mark the starboard corner of the bow. The bow itself is more intact, having fallen to starboard to leave the port side uppermost.
In good visibility there is an opportunity to swim through from the back of the bow (18) and out of the hole left where the anchor winch has broken away.
The anchor winch is on the seabed, tilted back with the underside of its mounting plate facing forward (19). Rounding the tip of the bow, the port anchor is still tight in place (20). Depth here is about 44m.
From here we can finish our dive by releasing a delayed SMB from the seabed, or by ascending to the upper (port) corner of the bow to set off a delayed SMB from 40m.

Thanks to Andy Lawrence and David Aplin.

TOUR GUIDE

GETTING THERE: For Weymouth, follow the A37 or A354 to Dorchester, then the A354 to Weymouth and on to Portland via Chesil Beach, turning left for the old Castletown dockyard as the road starts to climb the hill to Portland. Breakwater Diving is located at the Aqua Sport hotel, on the left as you enter Castletown.
TIDES: Slack water is 2.5 hours before high water Portland and 4 hours after high water Portland, though not on spring tides.
HOW TO FIND IT: The GPS co-ordinates are 50 27.670N, 002 08.074W (degrees, minutes and decimals). The wreck lies across the tide with the bow to the north.
DIVING, ACCOMMODATION & AIR: Breakwater Diving Centre, 01305 860269, divedorset.com, hotelaqua.co.uk.
QUALIFICATIONS: An advanced dive that can benefit from a rich nitrox mix for decompression.
LAUNCHING: Slips are available at Weymouth, Portland and Kimmeridge. Harbour and launch fees are payable.
FURTHER INFORMATION: Admiralty Chart 2610, Bill of Portland to Anvil Point. Ordnance Survey Map 194, Dorchester, Weymouth & Surrounding Area. Dive Dorset by John & Vicki Hinchcliffe. WW1 Channel Wrecks by Neil Maw. Weymouth tourist information, 01305 785747.
PROS: A nice wreck that is less dived than many in the area. Its unlikely to be crowded.
CONS: A bit deep for the average club dive.




Broken
Broken winch that once served the forward holds.

A
A low- pressure cylinder from the triple-expansion engine that has fallen to port, with switch gear fallen above it.

Cargo
Cargo winch between the aft holds.

Steering
Steering engine above the stern.

Spare
Spare anchor shackled to the main deck behind the bow.

Divernet


DEPTH
-20m width=100%
45m+width=100%
35m-45mwidth=100%
45m+width=100%
DIFFICULTY RATING


ACE STRIKES AGAIN
IOLANTHE,, cargo steamer, BUILT 1904, SUNK 1918
The 3081-ton Iolanthe steamed quickly past the Shambles Lightship and left a straight white wake in the moonlight as she stopped zig-zagging at exactly 10.35 on 4 January, 1918, writes Kendall McDonald.
Iolanthe was steering east by south and kept up the speed of nine knots only for the short time she was passing the lightship, in case a U-boat was planning to use the area as a killing ground.
Then she started zig-zagging again, as her orders instructed her to do every 15 minutes.
At 11pm she was safely 10 miles SE by E of Portland Bill, but Captain James Scott maintained a strict watch for submarines.
On watch he had two officers with him on the bridge, another look-out on the forecastle, and Leading Seaman John Rooke, one of the two gunners who manned the 12-pounder gun on the stern. However, none of them knew that they had become the watched in the past 20 minutes.
Bound from Greenock for St Helens, Iolanthe carried military supplies and a big cargo of hay in her holds, and on deck were railway wagons.
The crew of 30 Britons and one Norwegian saw nothing until, at 11.05, a colossal explosion erupted on the ships port side.
U-boat ace Oberleutnant Johann Lohs had put a torpedo from a bow tube of UC75 into Iolanthes port side, close to No 3 hold, and ripped a huge hole in her hull. Despite this, the ship appeared still to be buoyant, and the crew tried to get some direction on her, but she soon started to settle.
Just after midnight, it was clear that she was about to founder. Captain Scott gave the order to abandon ship. As they pulled clear, they had their first sight of the U-boat as it came out of the dark before disappearing seawards.
Two patrol trawlers tried to take the steamer in tow, but as soon as they got lines aboard, Iolanthe sank. All her crew were landed safely at Weymouth.
The ship, 325ft long with a beam of 49ft, had been built by W Gray and Co of Hartlepool. The wreck remained missing and undived until very recently. She was discovered by the Ballett brothers of Poole, who confirmed their find by bringing up her bell.