Subsea Cable Damage Claims: The Legal Approach

Nicholas Kazaz discusses some of things that cause subsea cable damage and how to deal with them from a legal perspective.By Nicholas Kazaz
March 16, 2020

Subsea cables have a long history reaching back almost two centuries, starting with the first international subsea cable, which was laid across the English Channel in 1850.  Over recent years, the number of cables has considerably increased.  In a world which relies heavily on digital telephony, internet, and the transmission of electricity, subsea cables have gained an important and essential role.  97% of global communications are transmitted by subsea cables, and there is no alternative to using them as satellite technology cannot effectively handle the communication requirements of the modern digital economy and society.  Financially, the cables are essential, carrying over US$10 trillion of financial transfers and processing some 15 million transactions daily[1].

Whilst the majority of recently installed cables are buried beneath the seabed, a percentage of them are unburied, which risk being scoured out by tides and currents, or being snagged by fishing gear or ship anchors.  Crucially, in recent years there have been an increasing number of claims for cable breaks, which can be expensive and disruptive.  This article focuses on why those claims arise, and how a cable owner or operator may pursue those claims.


Fishing vessels

Fishing vessels with towed gear, bottom and beam trawls, and dredges are one of the most common causes of damage to subsea cables, and account for over a third of all cable damage[2].   Although there was no damage to a subsea cable in this case, the loss of the trawler WESTHAVEN in 1997[3] remains a stark illustration of the risk posed by obstructions on the seabed.  One of the WESTHAVEN’s trawl doors passed under, and subsequently became snagged on, an oil pipeline in the North Sea.  Whilst attempting to free the net, the vessel capsized, and all four crewmembers lost their lives.  This casualty followed a succession of fishing vessels sinking in the late 1980s including GAYLORD, MHARI L and GREY FLAMINGO, which were lost when their gear became fouled on subsea cables, and resulted in damage to the cable systems themselves.

Ship anchors

A large proportion of reported accidents that have resulted in damage to subsea cables relate to anchors, including from fishing vessels, and other merchant vessels such as tugs and anchor handlers.  Statistics show that anchors account for nearly a fourth of subsea cable damage.[4]  Most of these accidents tend to be caused by fishing or merchant vessels anchoring outside the designated areas, and recent fault records show that merchant ships often fail to secure their anchors securely during short passages.

To continue reading the rest of this article, please read it in Issue 111 of the SubTel Forum Magazine on page 48 or on our archive site here.

[1] Rishi Sunak MP, ‘Undersea Cables: Indispensable, insecure‘, a Policy Exchange Report, 2017.

[2] ‘The various threats to subsea cables’ (Ultramap) <> accessed 9 March 2020.

[3] Marine Accident Report 4/98, Report of the Inspector’s Inquiry into the loss of the Fishing Vessel WESTHAVEN AH 190 with four lives on 10 March 1997 in the North Sea, November 1998.

[4] ‘The biggest threat to subsea cables and what to do about it’ (Ultramap) < > accessed 4 March 2020.