PURPOSE: To provide for warming divers by forcing part of air of a bomb into a bag of chemical pyrogen equipped inside diving suits to start reaction between the pyrogen and air.

CONSTITUTION: A bomb 1 is equipped with an automatic air supply regulator 2 which forces air with appropriate pressure corresponding to a diving depth, to both a mouth piece 3 and a container bag of the pyrogen 11 via a pipe 4. Wet suits 10 have an inlet valve 7. By depressing a push button 8 continuously air is forced into the bag 11. By depressing a push button 13, an emergency water injection and exhaust valve 14 forces water into the bag 11.