STUDENT AND INSTRUCTOR PLTS ABOARD GA7 SUFFER GEAR COLLAPSE UPON LNDG.

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MY STUDENT AND I EXPERIENCED A COLLAPSED LNDG GEAR ON TOUCHDOWN ON RWY 14 AT ZZZ ARPT. MY STUDENT WAS AT THE CTLS OF GRUMMAN COUGAR GA-7 AND I WAS INSTRUCTOR PLT FOR THIS TRAINING FLT. THE APCH TO THE LNDG MISHAP WAS TO BE THE FOURTH FULL STOP LNDG AT ZZZ. ON DOWNWIND LEG; MY STUDENT LOWERED THE LNDG GEAR AND GEAR DOWN WAS INDICATED. THE ACFT RESPONSE APPEARED NORMAL FOR THE LNDG GEAR COMING DOWN. PWR WAS REDUCED TO ABOUT 15 INCHES OF MP AND A 500 FPM DSCNT WAS INITIATED. FINAL APCH WAS FLOWN WITH 30 DEGS OF FLAPS WITH NORMAL APCH PWR. ANOTHER GEAR CHK WAS MADE ON BASE LEG. DURING THE FLARE TO LNDG; APCHING WHAT SEEMED TO BE NORMAL ATTITUDE AND TOUCHDOWN HT; I NOTICED WHAT FELT LIKE THE LNDG GEAR TOUCHING DOWN LIGHTLY; HOWEVER; IT APPEARED THE GEAR COLLAPSED AT THIS POINT AND THE ACFT SETTLED ONTO THE RWY WITH PROPS STRIKING THE SURFACE. WE SKIDDED DOWN THE RWY FOR WHAT SEEMED LIKE A LONG TIME AND WE THEN MADE AN IMMEDIATE EMER EVAC. ON POSTFLT INSPECTION; BOTH L AND R LNDG GEAR WERE OUT OF THE WHEEL WELLS AND COLLAPSED UNDER THE WINGS.