This study investigates the physiological and biochemical resilience of four cyanobacteria strains, Calothrix parietina, Aulosira fritschii, Tolypothrix bouteillei and Nostoc punctiforme following exposure to 0.5 kGy/hr gamma radiation.  Results indicate a significant capacity for recovery, suggesting potential resistance against radiation. C. parietina exhibited a 63.2% growth increase after 60 min of exposure with absorbed dose 0.5 kGy while T. bouteillei showed a 61.9% biomass increase at the 90 min dose with absorbed dose 0.75 kGy by day 25. N. punctiforme initially suffered on day 5 due to filament shattering but eventually achieved an 8.9% increase over control levels. While initial exposure caused immediate morphological trauma, including filament breakage and pigment leaching, these stressors triggered a stress-adaptation mechanism. Chlorophyll a in C. parietina rose by 107.7% and carotenoids in T. bouteillei increased by 31.5%. Primary metabolites surged, with carbohydrate content reaching 550 µg/mL in T. bouteillei and total antioxidant activity in C. parietina peaking at 800 µg/mL. Moreover, protein content rose and carbohydrate levels surged, reaching high concentrations in T. bouteillei to fuel energy-intensive repair processes and potentially produce protective extracellular polysaccharides. Spectrophotometric analysis confirmed that rather than degrading, concentrations of chlorophyll a and carotenoids significantly increased to quench reactive oxygen species and protect the photosynthetic apparatus. Collectively, these observations project a radiotolerance architecture in these filamentous organisms that effectively utilizes the physical stress of ionizing radiation as a catalyst for metabolic surge, transforming initial cellular damage into a stimulus for enhanced biochemical production and long-term survival.