a compartment, that usually runs the length of the kayak, which in addition to providing more buoyancy allows for the kayaker to store various equipment in. "Sit on top" kayaks often use "through holes" which allows any water that got in the boat to make it through the deck and dry hatch to drain. "Cockpit style" involves sitting with the legs and hips inside the kayak hull with a spray deck or "spray skirt" that creates a water-resistant seal around the waist. There is a wide range of "cockpit style" boats which usually allow for more user control of the boat as they are able to push against the walls of the boat to tip in order to complete maneuvers. A common variant of "cockpit style" kayaks are "play boats" these are usually very short kayaks in which the user does tricks and maneuvers: "Inflatables" are a hybrid of the two previous configurations; these boats have an open deck, but the paddler sits below the level of the deck. These boats are often subject to more instability due to the way the boat sits higher in the water. They are often used in a more commercial setting, they are often affectionately called "Duckies". "Tandems" are configured for multiple paddlers, in contrast to the single person designs featured by most kayaks. Tandems can be used by two or even three paddlers. Activities involving kayaks Because of their range and adaptability, kayaks can be useful for other outdoor activities such as diving, fishing, wilderness exploration and search and rescue during floods. Diving Kayak diving is a type of recreational diving where the divers paddle to a diving site in a kayak carrying all their gear to the place they want to dive. The range can be up to several kilometres along the coastline from the launching point to a place where access would be difficult from the shore, although the sea is sheltered. It is a considerably cheaper alternative to using a powered boat, as well as combining the experience of sea kayaking at the same time. Kayak diving gives the diver independence from dive boat operators, while allowing dives at sites which are too far to comfortably swim, but are sufficiently sheltered. Fishing Kayak fishing is fishing from a kayak. The kayak has long been a means of transportation and a stealth means of approaching easily spooked fish, such as cobia