Wikipedia list four systems against torpedoes, which are active systems to destroy the torpedo - which maybe can be used against under-water drones:

Rafael's TORBUSTER a fourth-generation torpedo defense countermeasure developed by Rafael Advanced Defense Systems. Designed to neutralize incoming torpedoes in both shallow and deep water, it combines soft- and hard-kill capabilities.[5]
The U.S. Navy's Countermeasure Anti-Torpedo Torpedo (CAT), developed by Penn State's Applied Research Laboratory. The CAT system was designed to counter wake-homing torpedoes, which detect a ship's wake rather than its acoustic signature. The CAT torpedo operates autonomously after launch with “fire-and-forget” capability, using onboard sensors to search, target, and maneuver against threats. Developed under a high-priority program, CAT was produced within 24 months through extensive simulation-based design and modular construction, reducing costs significantly compared to legacy torpedoes. It was first deployed aboard the USS George H.W. Bush in 2013 and subsequently installed on additional vessels.[6][7]
The SeaSpider ATT system by ATLAS ELEKTRONIK has undergone successful live-fire trials. These tests involved detection and localization of incoming Mk 37-derived autonomous underwater vehicles (AUVs) and DM2A3 torpedoes using passive and active TDCL sonar systems. Upon detection, the SeaSpider interceptor was launched from an above-water launcher to intercept threats at their closest point of approach, with successful intercepts confirmed through acoustic and optical means.[8]
In addition, the RBU-1000 anti-submarine rocket launcher is alleged to have anti-torpedo capability.
Torpedo defense