system of choice. These models can become very expensive to build due to the complexity of their ballast systems. In the event of a loss of radio contact while submerged, the boat will most likely sink to the bottom and require manual retrieval, unless equipped with a fail safe system. However, the ability to dive while at a stand still has its advantages, as it can be more precise and scale like than dynamic systems. References External links The SubCommittee Submarine modelers Forum Explorer sub made from PVC pipe R/C Model Submarines & Submersible Video Platforms Submarine Robotic submarines