Former commander Cédric Chetaille, speaking in relation to the book *Abysses. La guerre qui vient*, has detailed the increasing dangers lurking beneath the ocean’s surface. He emphasizes the vastness of the ocean as a key factor, stating threats can originate from anywhere. The interview focuses on how conflict is transforming in the underwater domain, presenting new challenges to naval strategy. Chetaille, a former commander of a French nuclear attack submarine, highlights evolving threats requiring constant vigilance. He suggests that the sheer scale of the underwater environment makes detection and response incredibly difficult. This new landscape of underwater conflict demands a reassessment of current defense strategies. The discussion centers around the critical need to understand and prepare for these shifting dynamics in modern naval warfare.