Takao blocks I-401's path to Yokosuka by positioning herself inside the eye of a typhoon and, after asserting that any attempts to avoid confrontation are too risky, Gunzō decides to take Takao head on. After Iona barely manages to evade an attack from Takao's Super Gravity Cannon, Gunzō analyzes the resultant combat data and points out that Takao's attacks have had pinpoint accuracy from a distance much greater than its sensor capabilities. He concludes that this can only be possible if there is a second vessel possessing superior sensor technologies nearby, hypothesizing that a submarine is being concealed under Takao's hull. Gunzō then orders the crew to ready their own Super Gravity Cannon which they salvaged from their previous battle with the Fog battleship Hyūga and uses it to destroy the submarine and force Takao to surrender. Having her systems locked down for 24 hours by Iona to prevent her from give chase to the I-401, Takao wonders why Gunzō spared her and takes an interest in him.