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Introduction

In November 2019, a NORBIT team completed a bathymetric and FLS sonar survey around the barge wreck in the Dunabe River.

See the full video from the survey here:

System setup

  • System used: NORBIT iWBMS and WBMS FLS
  • Systems were mounted parallel on one pole
  • Platform: RHIB vessel
  • RTK used during the survey via cell phone
RHIB boat on the Danube River, equipped with NORBIT sonar systems for shipwreck mapping.
NORBIT survey vessel on the Danube River, used to map the sunken barge near Liberty Bridge.

History of Liberty Bridge

Ferenc József bridge was blown up by retreating German troops in 1945. The central section of the bridge which had been blown up, was rebuild in and reopened in August 1946, with the new name Liberty bridge. Barges were used to bring in logs for the construction. A barge sank during the construction period and was left on the riverbed.

Liberty (former Ferenc Jozsef) Bridge during reconstruction. Image credit: welovebudapest.hu
Liberty (former Ferenc Jozsef) Bridge during reconstruction. Image credit: welovebudapest.hu

Survey of Sunken Barge in Dunabe River

The dismantling of the sunken barge was planned as early as 1948, however, the authorities never considered the issue to be important, especially since no one had ever been able to prove that the cargo of the barge sitting outside the main river fairway, was dangerous, hence the wreck was left alone.

In 2004 a diver claims that a barge is under water at Belgrade Quay, with up to seven hundred tons of ammunition aboard.

Liberty (former Ferenc József) Bridge with the sunken barge
Liberty (former Ferenc József) Bridge with the sunken barge

The Hungarian Defense Forces, with fifty people, including twenty divers, and two de-mining boats, took part in an action organised by the Defense Forces, to investigate the barge.

Divers found mud in the middle of the barge and thought it might contain bombs or ammunition.

The underwater investigation also included photos and video footage of the Army divers, who also exposed a large wooden pole from the ship. From what the divers saw, it was easy to imagine that the first diver might have looked at logs and debris, which could have resembled ammunition in the muddy water

Cargo material and divers during recovery
Cargo material and divers during recovery - Image credit: index.hu
Logs inside the hull are visible on the bathymetric image
Logs inside the hull are visible on the bathymetric image
Logs visible in bathy data image
The logs found were visible in the bathy data.
iWBMS multibeam bathymetry sonar data
iWBMS multibeam bathymetry – sonar data – 400kHz
Survey vessel on the Danube river
The survey vessel on the Danube river

iWBMS Bathymetric Sonar Results

The images below provide the results from the iWBMS Bathymetric Sonar scan. (image slider)

GIU – bottom detection on cargo door openings
GIU – bottom detection on cargo door openings
Survey was conducted aliong parallel and perpendicular lines
Survey was conducted aliong parallel and perpendicular lines

iWBMS and FLS Sonar results

NORBIT GIU parallel usage of Bathy and FLS sonar
NORBIT GIU parallel usage of Bathy and FLS sonar

FLS Sonar images

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