The tunnel caverns, arches and lava tubes are excellent venues for picture taking or setting a night dive with Manta Rays or a blue water dive to search for the spotted and bottlenose dolphins, pygmy killer whales, pilot whales and whale sharks. It is recommended to take a guide if you are planning to dive in Hilo side of the island. A wraparound mask has two additional panes of glass on its sides to improve peripheral vision. In low-profile mask, it has a notched faceplate and a nose pocket to allow your nose to protrude past the plane of the lens. When you are going to buy a scuba mask, you should choose a mask with tempered glass lens plate. The instructor will now send a form to the diving agency, such as PADI and NAUI, which certifies that the diver passed all the requirements as a diver on a particular level. The agency in turn will send a Certification Card or C-Card to the diver who just passed all the standard requirements imposed by the agency. Aruba is certainly the destination for you if you seek a unique dive site filled with exotic marine animals. If you plan on going on a diving vacation in Aruba, you should prepare all your necessary diving gears the day before you depart for the trip. Make a checklist in order to make sure that you will never leave any essential things behind. Scuba tanks are attached at the back of scuba divers and are filled with compressed air and never oxygen. Most people who never took scuba lessons commonly think that scuba tanks are filled with oxygen. This is a common misconception and you should know that scuba tanks are never filled with pure oxygen. There are many tourist destinations like the scuba resorts that are well known to people. Thailand is offering the best scuba diving resorts that have special instructors for people having great passion for scuba diving. The instructors are there to give guidance to the divers and enhance their skills more.