Bluefin-21, an autonomous underwater vehicle, helps search for missing Malaysian Airlines Flight 370. It's able to carry multiple sensors at once, and good at enabling extended operations even at the greatest depths.
| Diameter | 21 in (53 cm) |
| Length | 16.2 ft (493 cm) |
| Weight (Dry) | 1,650 lb (750 kg) |
| Buoyancy | ~ 16 lb (7.3 kg) net positive |
| Lift Points | 1 (located mid-vehicle) |
| Depth Rating | 14,763 ft (4,500 m) |
| Endurance | 25 hours @ 3 knots with standard payload |
| Speed | Up to 4.5 knots |
| Energy | 13.5 kWh of total energy Nine 1.5 kWh battery packs Lithium-polymer, pressure-tolerant |
| Propulsion | Gimbaled, ducted thruster for propulsion and control |
| Navigation | Real-time accuracy ≤ 0.1% of D.T. CEP 50 INS, DVL, SVS and GPS USBL tracking with vehicle position updates |
| Antenna | Integrated — GPS, RF, Iridium and strobe |
| Communications | RF, Iridium and acoustic; Ethernet via shore power cable |
| Safety Systems | Fault and leak detection, dropweight, acoustic tracking transponder, strobe, RDF and Iridium (all independently powered) |
| Software | GUI-based Operator Tool Suite |
| Data Management | 4 GB flash drive for vehicle data Plus additional payload storage |
| Standard Payloads (others available) | EdgeTech 2200-M 120/410 kHz side scan sonar (option: EdgeTech 230/850 kHz dynamically focused) EdgeTech DW-216 sub-bottom profiler Reson 7125 400 kHz multibeam echosounder |