Submarine
◾Which is world smallest submarine ?
◾Sarafia is the smallest submarine in the world which is about 40 cm long with five propeller and a plastic hull crammed. It work on rechargeable batteries. It has a speed of 1 meter per second it can hover, tilt and right itself if over turned. It cost about $ 1000 per unit
◾Who's developed Sarafina ?
Sarafina is developed by Australian National University
◾Which is first military submarine :-
It was named "Turtle" designed by David Bushell it was egg-shaped and hand powered. It can accommodate only a single man. It was also used in world war II it did attempt to sink a British warship but however failed
