Dendritic Decomposition
First-Principles System Design — Deep-Sea Survey AUV
Deep-Sea Survey AUV›
3,000m depth · 72-hour endurance · fully autonomous
Mission Goal
Pressure Envelope›
30.4 MPa hydrostatic — the dominant structural constraint
Physics Constraint
Energy Budget›
Finite power, no resupply — every watt is a design decision
Physics Constraint
Communication›
RF is dead underwater — acoustic and timing are all you have
Physics Constraint
Navigation›
No GPS, no landmarks — dead reckoning with corrections
Physics Constraint
Propulsion & Hydrodynamics›
Cube-law physics — speed costs power cubically
Physics Constraint
Sensing Payload›
The reason the vehicle exists — survey-grade ocean floor mapping
Mission Requirement
Autonomy & Fault Management›
Isolated operation demands self-sufficient decision-making
Autonomy / Software
Deep-Sea Survey AUV
Deep-Sea Survey AUV
3,000m depth · 72-hour endurance · fully autonomous
Active Path◎ Mission Goal
1/53 explored
Analysis
An autonomous undersea vehicle designed for deep-ocean bathymetric and geological survey missions. Operating at 3,000 meters for 72 continuous hours without human intervention, tethered support, or mid-mission resupply. Every subsystem decision traces back to the intersection of three coupled first-principle constraints: hydrostatic pressure, finite energy, and complete operational isolation. These constraints are not independent — pressure drives hull mass which drives buoyancy deficit which drives energy consumption. Energy limits endurance which limits survey coverage. Isolation demands autonomy which demands computational power which draws energy. The system is irreducibly coupled.
First Principle
The three fundamental constraints — pressure, energy, and isolation — form a coupled design space. You cannot optimize one axis without perturbing the others. This is why dendritic decomposition matters: it reveals the coupling that siloed engineering disciplines miss.
Key Metrics
3,000 m
Operating Depth
~300 atm
Hydrostatic Pressure
72 hours
Mission Endurance
2–3 knots
Survey Speed
~800 kg
Displacement
~4.5 m
Length