Introduction
The arrest of a ship is a distinctive and powerful feature of admiralty law, allowing a claimant to secure their maritime claim by seizing the vessel as a form of pre-judgment security. This procedure, an action in rem, is brought against the property itself—the ship—rather than against its owner directly. While the most straightforward application of this power is the arrest of the particular ship in connection with which the claim arose, English law, in certain circumstances, permits the arrest of an alternative vessel. This essay will explain when a "sister ship"—a ship not directly involved in the incident giving rise to the claim but under the same ownership—can be arrested. The analysis will focus on the statutory framework provided by the Senior Courts Act 1981, which governs admiralty jurisdiction in England and Wales. It will be shown that the ability to arrest a sister ship depends on satisfying strict criteria relating to the nature of the claim and, crucially, the "beneficial ownership" of both the offending vessel and the sister ship at specific points in time.
The Foundations of Ship Arrest: Actions in Rem
To understand sister ship arrest, it is first necessary to grasp the concept of the action in rem. Unlike an action in personam, which is a personal action against a defendant, an action in rem is directed at the property, or res. In admiralty, the res is typically the ship, its cargo, or freight. The primary purpose of an in rem action is to obtain security for the claim (Gaskell, 2021). By arresting the vessel, the claimant effectively freezes the asset, preventing it from leaving the jurisdiction. This forces the owner to either settle the claim or provide alternative security, such as a bank guarantee or a payment into court, to secure the vessel’s release.
The legal basis for this jurisdiction in England and Wales is found in the Senior Courts Act 1981 (SCA 1981), which incorporates the principles of the International Convention for the Unification of Certain Rules relating to the Arrest of Sea-going Ships 1952 (the "Arrest Convention 1952"). Section 20(2) of the SCA 1981 lists the specific types of "maritime claims" that can support an action in rem. These include claims for damage done by a ship, loss of or damage to goods carried in a ship, agreements for the hire of a ship, and salvage, among others. A claimant can only proceed with an arrest if their claim falls within this exhaustive list.
The Statutory Power to Arrest a Sister Ship
The core provision enabling the arrest of a sister ship is section 21(4) of the Senior Courts Act 1981. This section extends the right of arrest beyond the particular ship to which the claim relates, provided a precise set of conditions are met. It is essential to break down the requirements of this subsection to understand its application.
Section 21(4) states that an action in rem may be brought in the High Court against:
"(a) that ship, where the claim arises in connection with a ship and the person who would be liable on the claim in an action in personam (‘the relevant person’) was, when the cause of action arose, the owner or charterer of, or in possession or control of, the ship; or (b) any other ship of which, at the time when the action is brought, the relevant person is the beneficial owner as respects all the shares in it."
This provision creates a two-limbed test. The first limb, s.21(4)(a), relates to the arrest of the "offending ship" itself. The second limb, s.21(4)(b), is the gateway to arresting a sister ship. To successfully invoke s.21(4)(b), a claimant must establish two critical ownership connections at two different points in time.
First, the claimant must identify the "relevant person." This is the individual or company who would be personally liable for the claim. At the time the cause of action arose (e.g., when the collision occurred or the cargo was damaged), this "relevant person" must have been the owner, charterer, or in possession or control of the ship in connection with which the claim arose.
Second, if that condition is met, the claimant may then bring an action in rem against "any other ship." The crucial requirement is that this other ship—the sister ship—must be beneficially owned by that same "relevant person" at the time the action is brought (i.e., when the claim form is issued).
This creates a clear but strict formula. The link between the "relevant person" and the offending ship is tested at the moment the claim arose. The link between that same person and the sister ship is tested at the moment the legal action commences. If the ownership of the sister ship changes hands between the claim arising and the action being brought, the right to arrest it is lost.
The Meaning of "Beneficial Ownership"
The concept of "beneficial ownership" in s.21(4)(b) is the most significant and often litigated aspect of sister ship arrest. The statute does not define the term, leaving its interpretation to the courts. It is now well-established that "beneficial ownership" looks beyond the flag of the ship or the name on the official register to identify the true owner who enjoys the financial benefits and rights of ownership (Hill, 2003).
The courts will "pierce the corporate veil" to a limited extent to identify the real owner. In the case of The Aventicum [1978] 1 Lloyd's Rep 184, it was held that the court has the power to look behind the registered owner to determine who the true beneficial owner is. This prevents shipowners from avoiding arrest by registering their vessels under separate, single-ship companies while retaining ultimate control and ownership. Therefore, if a fleet of ships is ultimately owned by the same parent company or individual, each vessel can be treated as a sister ship of the others for arrest purposes.
However, the scope of this is not unlimited. The courts have been clear that beneficial ownership requires rights of ownership, not just rights of use or control. In The Maritime Trader [1981] 2 Lloyd's Rep 153, the court confirmed that a demise charterer, who has extensive control and possession of a vessel, is not the "beneficial owner" for the purposes of s.21(4). A demise charterer is akin to a lessee of the ship, but they do not own the asset. This distinction is vital: while a claim can be founded against a ship when the relevant person was a demise charterer (under the first part of the test), that person's status as a demise charterer of another vessel does not make that other vessel a "sister ship" available for arrest. The "relevant person" must be the full beneficial owner of the ship to be arrested.
Limitations on the Right of Arrest
While s.21(4) provides a powerful remedy, the law places important restrictions on its use to prevent it from becoming an oppressive tool. The most significant limitation is that a claimant can only arrest one ship per claim. This principle was established in The Banco [1971] P 137 and is now reflected in s.21(8) of the SCA 1981. A claimant with a single claim cannot arrest the offending ship and then proceed to arrest multiple sister ships to obtain ever-greater security. They must make a strategic choice: arrest the offending ship or arrest one, and only one, of its sister ships. Once a ship has been arrested and released in an action, no other ship may be arrested for the same claim.
A further limitation relates to sovereign immunity. The State Immunity Act 1978 grants immunity from jurisdiction, including arrest, to ships owned by foreign states which are in use or intended for use for public, non-commercial purposes. Therefore, a claimant cannot arrest a naval vessel or other state ship on public service as a sister ship, even if it is beneficially owned by the same state entity liable for a claim arising from one of its commercial vessels (The I Congreso del Partido [1983] 1 AC 244).
Conclusion
In conclusion, the arrest of a sister ship in England and Wales is a carefully circumscribed legal procedure governed by section 21(4) of the Senior Courts Act 1981. It is not available for all maritime claims and depends entirely on the claimant’s ability to prove a specific set of ownership connections. The central conditions are, first, that the person who is personally liable for the claim was the owner or in control of the offending ship when the incident occurred, and second, that this same person is the beneficial owner of the sister ship when the legal action is formally commenced. The courts’ interpretation of "beneficial ownership" allows claimants to look behind complex corporate structures to identify the true owner, making the remedy effective against modern shipping fleet arrangements. However, this power is balanced by strict limitations, most notably the rule that only one vessel may be arrested per claim. Ultimately, sister ship arrest provides claimants with a crucial and flexible tool for securing their claims, ensuring that a shipowner cannot easily evade liability simply by moving the particular ship involved out of the jurisdiction.
References
Cases
The Aventicum [1978] 1 Lloyd's Rep 184
The Banco [1971] P 137
The I Congreso del Partido [1983] 1 AC 244
The Maritime Trader [1981] 2 Lloyd's Rep 153
Legislation
Senior Courts Act 1981
State Immunity Act 1978
International Conventions
International Convention for the Unification of Certain Rules relating to the Arrest of Sea-going Ships 1952
Books
Gaskell, N. (2021) Bills of Lading: Law and Contracts. 2nd edn. Informa Law from Routledge.
Hill, C. (2003) Maritime Law. 6th edn. LLP.
