Under what condition can a vessel engaged in laying or servicing submarine cables in a TSS be exempt from compliance?

A vessel engaged in laying or servicing submarine cables within a Traffic Separation Scheme (TSS) can be exempt from compliance with certain navigation rules when it is necessary to carry out the operation. This exemption is designed to allow vessels to perform critical tasks without being unduly hindered by regulations that could impede their work, particularly in operations that are often time-sensitive and essential for maintaining marine infrastructure.

These operations are typically subject to specific provisions under the COLREGs to ensure the safety of navigation and protect the interests of other vessels, while still allowing the cable-laying or servicing vessel to fulfill its necessary functions. By prioritizing the operational need, the regulations acknowledge the importance of maintaining submarine cables, which play a crucial role in global communications and navigation systems.

The other options, while relevant to various scenarios, do not address the specific condition under which an exemption is allowed in this context. For instance, being accompanied by a support vessel may enhance safety but does not necessarily warrant an exemption. Similarly, the absence of collision risk or notifying traffic control, while generally important for navigation safety, do not specifically justify an exemption under the regulations governing operations in a TSS.