Could Gibraltar's current prevent a mine barrier?

Could Gibraltar be mined despite the strong current through the strait?

Yes, using anchored mines to narrow the passage and supporting them with submarine torpedoes, coastal guns and surface ships.

The question identifies a strong current as an obstacle to mining the strait. Anchored mines are the proposed answer, with mine placement narrowing the routes available to ships. Two or three T-class submarines could then concentrate their torpedoes on the passage left open. Evasive turns could carry targets outside a swept lane, while Gibraltar's guns and nearby British ships would make sweeping under fire difficult. This arrangement belongs to the counterfactual about captured fleets attempting to join a German invasion force.