I. Introduction and Legal Framework
The law governing ship mortgages and maritime liens in the Philippines is primarily codified in Presidential Decree No. 1521, also known as the Ship Mortgage Decree of 1978, as amended. This special law operates within the broader context of the Code of Commerce and relevant provisions of the Civil Code, but its provisions prevail as the lex specialis on the matter. The regime establishes a system for the registration of security interests in vessels and recognizes certain privileged claims that attach to the vessel itself, irrespective of ownership.
II. Definition and Nature of a Ship Mortgage
A ship mortgage is a contract whereby a vessel, or a share therein, is hypothecated as security for the repayment of a loan or the fulfillment of an obligation. It is a real right over the vessel, enforceable against third parties only from the date of its recording in the proper registry. The mortgaged vessel remains in the possession of the mortgagor, but the mortgagee acquires an in rem security interest that follows the vessel.
III. Requirements for Validity and Perfection
For a ship mortgage to be valid and binding against third parties, the following requisites must be strictly complied with: (a) The mortgage must be constituted by the owner of the vessel; (b) It must be in a public instrument; and (c) It must be recorded in the Philippine Ship Registry where the vessel is registered. Failure to record renders the mortgage binding only between the parties but not against subsequent innocent purchasers or mortgagees in good faith.
IV. Effects and Priority of a Registered Mortgage
A duly registered mortgage confers upon the mortgagee the right to: (1) exact fulfillment of the secured obligation; (2) foreclose the mortgage judicially or extrajudicially upon default; and (3) pursue the vessel wherever it may be found. Its priority is generally determined by the date and time of its recording. A registered mortgage enjoys preference over all claims against the vessel, except only for preferred maritime liens and those liens which, under the law, enjoy absolute preference (e.g., expenses for the preservation of the vessel).
V. Concept and Characteristics of Maritime Liens
A maritime lien is a privileged claim upon a vessel, arising from certain maritime transactions or services rendered to the vessel. It is a secret, non-possessory right that attaches to the vessel from the moment the claim arises, “travels” with the vessel irrespective of changes in ownership or registration (except to a bona fide purchaser without notice), and is enforced through an action in rem. It is distinct from and superior to an ordinary personal claim against the shipowner.
VI. Enumerated Preferred Maritime Liens
Under Section 17 of the Ship Mortgage Decree, the following claims constitute preferred maritime liens and shall be paid in the order listed, with those in each class paid pro rata if the fund is insufficient:

VII. Priority of Claims: The Hierarchy
The absolute priority of claims against the value of the vessel is as follows, from highest to lowest:

VIII. Extinguishment of Maritime Liens
A maritime lien is extinguished by: (a) payment or satisfaction of the claim; (b) waiver; (c) the sale of the vessel to a bona fide purchaser for value without notice of the lien, upon delivery of possession; and (d) lapse of time. Notably, the Ship Mortgage Decree does not prescribe a specific prescriptive period for maritime liens; thus, general rules on prescription under the Civil Code may apply, though the one-year period for bringing an action in rem under the Rules of Court is a crucial procedural bar.
IX. Practical Remedies
To enforce a ship mortgage, the mortgagee must initiate foreclosure proceedings, which may be judicial or, if stipulated in the public instrument, extrajudicial, followed by a public auction. To enforce a maritime lien, the claimant must file an action in rem against the vessel itself, which typically involves the arrest or attachment of the vessel through an order from the Admiralty court. Prompt registration of a mortgage is non-negotiable to secure priority. For lien claimants, immediate verification of a vessel’s lien history with the Ship Registry and the prompt filing of an action, coupled with an application for a writ of attachment, are critical to prevent the vessel’s departure or its transfer to a bona fide purchaser. In all cases, engaging maritime sheriffs and adhering to the special procedural rules for admiralty actions under the Rules of Court is essential for effective enforcement.