Tasman Bridge Disaster - Collision and Collapse

Collision and Collapse

The collision occurred at 9:27 pm (Australian Eastern Summer Time UT+11) on Sunday 5 January 1975. The bulk carrier Lake Illawarra, carrying 10,000 tonnes of zinc ore concentrate, was heading up the Derwent River to offload its cargo to the Electrolytic Zinc Company at Risdon, upstream from Hobart and about 3 km from the bridge. The 1 025m long main viaduct of the bridge was composed of a central main navigation span, two flanking secondary navigation spans, and 19 approach spans. The ship was off course as it neared the bridge, partly due to the strong tidal current but also because of inattention by the ship's master, Captain Boleslaw Pelc. Initially approaching the bridge at eight knots, Pelc slowed the ship to a 'safe' speed. Although the Lake Illawarra was capable of passing through the bridge's central navigation span, the captain attempted to pass through one of the eastern spans.

Despite several changes of course, the ship proved unmanageable due to its insufficient speed relative to the current. In desperation the captain ordered 'full speed astern', at which point all control was lost. The vessel drifted towards the bridge midway between the central navigation span and the eastern shore, crashing into the pile capping of piers 18 and 19, bringing three unsupported spans and a 127 m section of roadway crashing into the river and onto the vessel's deck. The ship listed to starboard and sank within minutes in 35 m of water a short distance to the south. Seven crew members on the Lake Illawarra were trapped and drowned. The subsequent marine court of inquiry found that the captain had not handled the ship in a proper and seamanlike manner, and his certificate was suspended for 6 months.

As the collision occurred on a Sunday evening, there was relatively little traffic on the bridge. While no cars were travelling between the 18th and 19th pylons when that section collapsed, four cars drove over the gap, killing five occupants. Two drivers managed to stop their vehicles at the edge, but not before their front wheels had dropped over the lip of the bridge deck. One of these cars contained Frank and Sylvia Manley, travelling with two young children in the back seat.

Sylvia Manley: "As we approached, it was a foggy night...there was no lights on the bridge at the time. We just thought there was an accident. We slowed down to about 40 km/h and I'm peering out the window, desperately looking to see the car...what was happening on the bridge. We couldn't see anything but we kept on travelling. The next thing, I said to Frank, "The bridge is gone!" And he just applied the brakes and we just sat there swinging. As we sat there, we couldn’t see anything in the water. All we could see was a big whirlpool of water and apparently the boat was sinking. So with that, we undid the car door and I hopped out."

Frank Manley: " said “The white line, the white line’s gone. Stop!" I just hit the brakes and I said “I can’t, I can’t, I can’t stop.” And next thing we just hung off the gap...when I swung the door open, I could see, more or less, see the water...and I just swung meself towards the back of the car and grabbed the headrest like that to pull myself around. There's a big automatic transmission pan underneath - that's what it balanced on."