Ok here's August Evils evil modern commerce raider plan:
To sink enemy vessels we develop
robotic limpet mines. A self propelled high explosive magnetic mine that attachs itself to the hull of a target ship and can be detonated hours or even days later by either timer or remote control. These mines alone or in groups (for say seeding an enemy harbor) are deployed from hatches located below the waterline of the commerce raider when it passes in the vicinity of a target ship.
To capture enemy vessels we use
midget submarines. Same general idea as the limpet mine but instead of high explosives it carries a prize crew as it's payload. They deploy, again from underwater hatches and attach to the targets hull, then they wait for the opportune moment to take her by boarding (Arrr).