Severn River

Mid-Atlantic ocean wreck and reef diving off Maryland, Virginia and Delaware is exclusively boat-based and weather-dependent, with most sites 8-25+ miles offshore, so heavy fishing-charter and recreational boat traffic makes divers hard to spot at the surface; an SMB plus audible/visual signaling devices are strongly advised. Because these wrecks and reefs are intensively fished, snagged monofilament line, lead, hooks and netting are everywhere and create a serious entanglement risk, making a dive knife or line cutter essential. Currents are a defining hazard — this stretch sits where the warm Gulf Stream meets the cold Labrador current, so currents can be strong and variable, divers often have to fight back to the anchor line, and free ascents risk being swept away from the boat. A pronounced summer thermocline is the norm, with comfortable high-60s to 70s+ water at the surface dropping sharply into the 50s-60s F below roughly 50 ft, where it is also much darker. Visibility is highly variable and usually limited, commonly 10-15 ft near the surface after Chesapeake/storm runoff and often 20-40 ft on the wreck, clearing toward 40-50 ft on the best Gulf Stream days; silt inside wreck structure is easily stirred up and can drop visibility to near zero. Depths frequently run 60-110+ ft, so it is easy to exceed recreational limits, and wreck steel is sharp and encrusted. Some sites are war graves (e.g., U-85, German-flag wartime wrecks) where penetration and artifact removal are prohibited, and a few historic wrecks may carry residual ordnance. Hurricanes and strong southerly/northeasterly weather routinely shut down or postpone diving.