Since underwater vehicles have been developed for a long time, those fundamental techniques are studied and established. In general, improvement of vehicle and/or attaching new equipments are quite difficult once the underwater vehicle is designed. Furthermore, vehicles are required various missions and/or different apparatus. In present, these problems are managed by changing attachment of manipulator in every mission. In this paper, underwater vehicle composed by modules is proposed. Every single function of underwater vehicle is separated to the module. The proposed vehicle is composed by these modules which are selected depend on necessity of instrument, area of investigation and environment. Each module are able to communicate by ZigBee which is one of wireless specification and unit.