The Dump, sometimes called the mud hole, is a broad area of soft bottom south of Martha's Vineyard (extending west toward Block Island) that has a long history as productive tuna water. The mud bottom supports squid and other forage, and the area sits within a workable run of Menemsha and the south-side Cape and Island ports.
The ground
Unlike a hard ledge, the Dump is soft, broad bottom, so the fish relate heavily to bait, temperature breaks and current rather than a single piece of structure. Squid are often a key part of the forage here.
How to fish it
Because it is a searching game over open ground, trolling to cover water and find life is the usual start, then working fish with jigs or bait. Watch for temperature breaks and bait.
Tip Over the broad mud of the Dump, temperature breaks and bait are your structure. Study the water-temperature charts before the run and troll the breaks and the bait, not just random open bottom.