Bomb shelter

Claim 1

A BOMB SHELTER COMPRISING A SUBSTANTIALLY SPHERICAL CASING FORMED WITH A COMPARTMENT THEREIN AND HAVING CASING WALLS FORMED FOR SHIELDING AND PROTECTING OCCUPANTS OF THE CASING FROM THE EFFECTS OF NUCLEAR EXPLOSIONS, SAID CASING BEING FORMED WITH AN ENTRANCE TO PROVIDE ACCESS TO SAID COMPARTMENT, CLOSURE MEANS FOR SAID ENTRANCE, A PLURALITY OF SMALL PASSAGES FORMED IN SAID CASING WALLS OPENING IN SAID COMPARTMENT AT THE INNER ENDS, EXTENDING IN ANGULAR RELATION TO EACH OTHER AND OPENING AT THE OUTER SIDES OF SAID CASING TO FORM PROBE HOLES, SAID PROBE HOLE PASSAGES BEING SPACED AT INTERVALS THROUGHOUT ALL SIDES OF SAID SPHERICAL CASING SO THAT IN ANY POSITION TO WHICH SAID CASING MAY BE DISPLACED AS A RESULT OF AN EXPLOSION, AT LEAST ONE OF SAID PROBE HOLES WILL EXTEND APPROXIMATELY UPWARDLY FROM THE TOP OF THE DISPLACED CASING, AND CLOSURE MEANS FOR EACH OF SAID SMALL PASSAGES DETACHABLY MOUNTED ON SAID CASING WALL AT THE INNER SIDE THEREOF IN SAID COMPARTMENT.