Bheemili Beach in Visakhapatnam is glowing blue; Bioluminescence explained

A few days ago, five M Tech students from Andhra University stumbled upon glowing blue waves at Bheemili Beach in Visakhapatnam. The videos of the rare occurrence went viral after Vizag Weatherman, a city-based blogger, shared them on social media platforms such as Twitter. The question is, how did the wave start glowing blue?