TL;DR
- The Reservoir requires drafting a Pool room first to unlock the Pump Room as an option
- You must establish continuous power from Boiler Room to Pump Room using electrical conduit rooms
- The reserve tank activation is essential for handling all 14 water levels
- Proper room sequencing prevents backtracking and saves significant time
- Draining reveals the Sanctum Key and access to previously flooded areas
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Are you ready to tackle the monumental task of draining the massive Reservoir in Blue Prince? This expansive underground cavern presents one of the game’s most complex environmental puzzles, hiding crucial secrets beneath its murky depths. Before diving into the technical details, be aware that this comprehensive walkthrough reveals significant spoilers about late-game progression.
The Reservoir serves as the central dividing feature within the Underground network, creating a natural barrier between the western access point (Fountain entrance) and eastern sector (Foundation entrance). Understanding this geographical layout is essential for planning your approach.
Complete drainage operations are managed through the Pump Room controls, following a similar principle to the earlier Fountain mechanism but with substantially increased complexity. Several critical preparatory steps differentiate this challenge:
This initiates the most technically demanding phase of Reservoir drainage in Blue Prince. The fundamental requirement involves establishing a functional Boiler Room within your manor layout, then creating an uninterrupted power conduit network to transmit energy to the Pump Room’s reserve tank mechanism.
Advanced Power Routing Strategy: Experienced players recommend creating redundant pathways to prevent system failure. The most efficient layouts typically utilize Security rooms as primary conduits due to their multiple connection points and reliable performance. When planning your Class Guide approach to room selection, consider that some rooms provide better electrical throughput than others.
Common Power Routing Mistakes: Many players fail to account for directional flow requirements—power must travel from Boiler Room to Pump Room, not vice versa. Additionally, ensure that intermediary rooms maintain proper alignment; misaligned connections will break the circuit despite visual indicators suggesting otherwise.
Optimal Room Drafting Sequence: Begin by establishing your Boiler Room in a central location with multiple expansion possibilities. Next, draft your Pool room to unlock the Pump Room option. Finally, strategically place conduit rooms to create the shortest possible path between power source and destination.
Time Investment Considerations: Properly executing the Reservoir drainage typically requires 45-60 minutes of focused gameplay, excluding exploration time for revealed areas. Inefficient routing can extend this to 90+ minutes due to necessary backtracking and room redrafting.
Verification Protocol: Before initiating the drainage sequence, systematically verify each connection point in your power network. The light blue indicator should appear consistently across all intermediary rooms. For comprehensive Complete Guide strategies, always test your system with a partial drainage first.
Troubleshooting Checklist: If the reserve tank fails to activate, check these common issues: Boiler Room operational status, conduit room orientation, pathway continuity, and Pump Room connection integrity.
Upon successful drainage completion, the Reservoir basin reveals multiple hidden compartments and environmental storytelling elements. The primary reward, the Sanctum Key, grants access to previously inaccessible areas containing valuable artifacts and narrative revelations.
Secondary Discoveries: Beyond the main key reward, thorough exploration of the drained basin uncovers additional collectibles, hidden passages, and environmental puzzles that expand the game’s lore. These discoveries often tie into broader progression systems similar to Weapons Unlock mechanics, where solving one puzzle unlocks multiple advancement opportunities.
Strategic Implications: Completing the Reservoir drainage represents a significant milestone in Blue Prince, opening up new routing options through previously submerged passages and providing access to end-game content areas.
Post-Drainage Checklist: After the water recedes, methodically search the entire basin area, investigate newly accessible tunnels, and utilize the Sanctum Key in corresponding locked areas throughout the manor grounds.
Action Checklist
- Draft Pool room to unlock Pump Room option
- Establish Boiler Room in central location with expansion capacity
- Create uninterrupted power pathway using Security/Archive conduit rooms
- Verify all connections via light blue indicator lines
- Activate reserve tank and initiate full drainage sequence
- Thoroughly explore drained basin for Sanctum Key and hidden passages
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