Skip to content

The Sesa (ex-Mallowdale )

The Sesa (ex-Mallowdale)

Only dived a few times, and only known as the “90m Clipper” due to its depth, this wreck has now been identified as The Sesa

From Dr Ross Anderson (WA Museum):

  • Of the five possible known sailing hulks scuttled in the Rottnest Graveyard of approximate similar length of 64-71m three can be excluded – Thornliebank, Loch Ness and Concordia — based on scuttling photographs due to their mast and deck configurations;
  • Kircudbrightshire is too long at 76 metres length, has 3 decks (one deck, 2 tiers beams) and was reported scuttled in 60 fathoms (109m) depth;
  • The iron ship Maranda, ex-Lord Canning, for which there are no scuttling images, is described as having one deck and two tiers of beams (‘1Dk2trB’). This usually means having a permanent main deck, with 2 lower levels of iron deck beams fixed to iron beam shelves, to allow the to allow the addition or removal of wooden deck planking, depending on cargo requirements. Thus at least three deck beam shelves should be visible on the wreck, which they are not.
  • The only ship that matches the Site 03 measured length of 64.7m and has two decks is the Sesa ex-Mallowdale, built in 1869 with a length of 64.5m and two decks. It was reported as being scuttled SW of Rottnest Island in 1928 in 50 fathoms (91.4m) depth, consistent with the 92m depth of the site. The difference in distance between Site 03 perpendiculars of 64.7m length and Sesa’s length of 64.5m is the best fit of any of the Graveyard hulks. The only other sailing hulk in the 62-68m length range is Concordia (67.8m), which can be discounted on the basis of its masts configuration.
  • Conclusion: The Sesa ex-Mallowdale is the most likely candidate for identification for the Graveyard Site 03 ‘90m Clipper’ site.

The MALLOWDALE was an iron ship built by the Lune Shipbuilding Company at Lancaster. In about 1889 the Mallowdale was reduced from ship to barque rig, and was sold to a French owner. She was renamed ADOLPHE (II) and was registered at Dunkirk. In about 1904 the barque was bought by the Adelaide Steam Ship Company and renamed SESA. Like the Jane Sprott, a Harrington-built vessel also owned by this company, she was used as a hulk. SESA was scuttled in the Rottnest ships’ graveyard, south west of Rottnest in 50 fathoms, 10 June or 4 July 1928. (Courtesy of

This model (26/11/2023) was made possible due to the support of our sponsors for the 2023/2024 season.
Advantage Air Australia
Dodd Group
Mondo Electronics
Heritage Council of WA

Funding for this dive was contributed to by WA Heritage Council.

3D Model


Static Images

Historical images

One of the few known images:

Sketch made of the wreck from ROV Footage

GPS Position and orientation
(Bow to the SE)

Access the details from the WA Museum Shipwreck Database Here

Access the details from Here