Wreck penetration diving involves entering the interior of a sunken ship, aircraft, or structure, going beyond the natural light zone or overhead environment.
Key Features:
•⁠  ⁠Advanced skills required – including buoyancy control, navigation, and line handling  
•⁠  ⁠Use of guidelines (reels/lines) for safety and exit tracking  
•⁠  ⁠Special equipment like torches, redundant air supply, and cutting tools  
•⁠  ⁠Training recommended: PADI Wreck Diver Specialty (with penetration option) or Technical Diving training  
Why do it?
•⁠  ⁠Explore hidden areas like cargo holds, engine rooms, or cabins  
•⁠  ⁠Experience history up close  
•⁠  ⁠See unique marine life that hides in enclosed spaces
 
Note: Penetration diving comes with increased risks (e.g. entanglement, silt-out, disorientation) and should only be done by properly trained divers.