The naval equivalent of trench warfare

Is there a naval equivalent of trench warfare?

Blockade and commerce raiding are the closest equivalents because they wage prolonged economic attrition at sea.

The analogy works at the strategic rather than tactical level. Fleets do not reproduce a continuous trench line at sea. Blockade instead imposes persistent pressure by constraining an opponent's trade and access. Commerce raiding complements it by destroying shipping, turning economic endurance into the naval war's attritional baseline.