Answer
Under the updated legal framework of The Merchant Shipping Act, 2025 (which replaced the old 1958 Act), the regulatory provisions for safety, seaworthiness, and detention are organized under Part IX (Safety and Security).
The specific section and clause references mapping the definitions of an Unseaworthy Ship versus an Unsafe Ship under Indian maritime law are broken down below:
1. Unseaworthy Ship
The statutory definition and the corresponding obligations are found in the following sections of The Merchant Shipping Act, 2025:
Definition & Prohibition: Section 127 ("Unseaworthy vessel not to be sent to sea").
Legal Definition: A vessel is deemed unseaworthy when the materials of which she is made, her construction, the qualifications of the master, the number and qualifications of the crew (including officers), the weight, description, and stowage of cargo/ballast, and the physical condition of her hull, machinery, and equipment make her unfit to undertake the intended voyage without endangering human life, property, or the marine environment.
Implied Obligation of Seaworthiness: Section 128 ("Obligation of ship owner, master or agent with respect to seaworthiness").
This section establishes the strict statutory duty imposed on the shipowner, master, and managing agent to use all reasonable means to ensure the vessel is maintained in a seaworthy state at the commencement of and throughout the voyage.
2. Unsafe Ship
The legal criteria regarding operational hazards and detention protocols for an unsafe vessel are defined under:
Definition & Core Criteria: Section 116 ("Safety and security requirements") read alongside the detention frameworks of Section 124 and Section 137.
Legal Definition: A vessel is classified as unsafe if, by reason of a temporary or operational defect in her hull, equipment, or machinery, or due to overloading or improper loading, she is unfit to proceed to sea without serious and imminent danger to human life or the environment.
Power of Detention: Section 137 ("Power to deny entry, detain or move vessel").
This section empowers the Central Government, through its duly authorized Port State Control (PSC) or Flag State inspectors, to issue a provisional or final detention order to prevent an unsafe vessel from proceeding to sea until the defects are rectified.