BOS 400 is a French derrick/lay barge that ran aground while being towed by the Russian tugboat Tigr on June 26, 1994.

Tigr was chartered to tow BOS 400 from Pointe-Noire in the Republic of Congo to Cape Town, South Africa.

The tow-rope broke loose during a huge storm and caused the vessel to run aground off Duiker Point near Sandy Bay,[2][3] at the same place as the earlier wreck of the SS Oakburn.

Despite several towage attempts, the shipwreck was considered a total loss as salvors were able to recover little from the wreck.

BOS 400 remains a wreck today, with a large crane and part of the superstructure visible above sea level.