A communication system (200, 200a-e) comprising: a first trunk terminal (110, 110a); a second trunk terminal (110, 110b); a plurality of communication trunks (222, 400) disposed along a floor of a body of water, each communication trunk (222, 400) coupling the first trunk terminal (110, 1 10a) to the second trunk terminal (110, 110b), each communication trunk (222, 400) comprising at least one signal amplifier configured to amplify a signal conveyed along a corresponding communication trunk (222, 400); wherein each communication trunk (222, 400) includes multiple low-availability trunk links as independent failure domains comprising a plurality of optical fibers, wherein each one of the links is operational for a low-availability period of time below a threshold period of time, wherein the at least one signal amplifier includes pump laser diodes that provide power laser pump to each communication trunk (222, 400) and wherein a single pump laser diode is shared across two or more of the plurality of optical fibers; and power feed equipment coupled to the plurality of communication trunks (222, 400), the power feed equipment configured to: deliver power along each communication trunk (222, 400) to power at least one signal amplifier of the communication trunk (222, 400); receive a fault notification identifying a cable cut fault or an electrical shunt fault along a faulted communication trunk (222, 400) of the plurality of communication trunks (222, 400); in response to the fault notification identifying the cable cut fault, route traffic from the faulted communication trunk (222, 400) to at least one non-faulted communication trunk (222, 400); and in response to the fault notification identifying the electrical shunt fault, ceasing deliver of power along at least one communication trunk (222, 400). a first trunk terminal (110, 110a); a second trunk terminal (110, 110b); a plurality of communication trunks (222, 400) disposed along a floor of a body of water, each communication trunk (222, 400) coupling the first trunk terminal (110, 1 10a) to the second trunk terminal (110, 110b), each communication trunk (222, 400) comprising at least one signal amplifier configured to amplify a signal conveyed along a corresponding communication trunk (222, 400); wherein each communication trunk (222, 400) includes multiple low-availability trunk links as independent failure domains comprising a plurality of optical fibers, wherein each one of the links is operational for a low-availability period of time below a threshold period of time, wherein the at least one signal amplifier includes pump laser diodes that provide power laser pump to each communication trunk (222, 400) and wherein a single pump laser diode is shared across two or more of the plurality of optical fibers; and power feed equipment coupled to the plurality of communication trunks (222, 400), the power feed equipment configured to: deliver power along each communication trunk (222, 400) to power at least one signal amplifier of the communication trunk (222, 400); receive a fault notification identifying a cable cut fault or an electrical shunt fault along a faulted communication trunk (222, 400) of the plurality of communication trunks (222, 400); in response to the fault notification identifying the cable cut fault, route traffic from the faulted communication trunk (222, 400) to at least one non-faulted communication trunk (222, 400); and in response to the fault notification identifying the electrical shunt fault, ceasing deliver of power along at least one communication trunk (222, 400). deliver power along each communication trunk (222, 400) to power at least one signal amplifier of the communication trunk (222, 400); receive a fault notification identifying a cable cut fault or an electrical shunt fault along a faulted communication trunk (222, 400) of the plurality of communication trunks (222, 400); in response to the fault notification identifying the cable cut fault, route traffic from the faulted communication trunk (222, 400) to at least one non-faulted communication trunk (222, 400); and in response to the fault notification identifying the electrical shunt fault, ceasing deliver of power along at least one communication trunk (222, 400).