Focusing waterproof flashlight

An underwater flashlight with an adjustable focusing beam comprising:

• a watertight housing having an inside and an outside and a lamp supporting bore therein;
• a lamp switch mounted to the outside of said housing;
• a battery pack removably attached to said watertight housing, said battery pack having at least one battery having two battery poles and being mounted in a waterproof housing removably attached to the outside of said watertight housing and having at least one electrical contact mounted to said battery housing, said battery pack having a magnetically actuated switch inside said waterproof housing connected between one said battery pole and a battery pack waterproof housing electrical contact whereby said battery pack is not actuated until said magnetically actuated switch is actuated upon connecting said battery pack to said flashlight watertight housing;
• a lamp slidably mounted in said housing lamp supporting bore, said lamp being operatively connected to said battery pack through said lamp switch;
• a slidable outside focusing member slidably mounted to said housing on the outside thereof and having a permanent magnet mounted thereto;
• a slidable inside focusing member slidably mounted to said housing on the inside thereof and having a permanent magnet mounted therein positioned to be moved by sliding said slidable outside focusing member to move said magnet mounted thereto while magnetically engaging said inside focusing member magnet;
• and
• a link having two end portions and being movably connected to said lamp on one end portion thereof, and to said slidable inside focusing member on the other end portion thereof;
• whereby movement of said outside focusing member slides said inside focusing member and focusing link to focus said lamp.