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1996 Expedition Niigata

Fremantle, Washington


IMMORTALIS was built in 1996 by Niigata shipyard for the Japanese government as a scientific research vessel. Her work included seismic surveying, fish stocks monitoring, carrying large loads and also worked as a crew training vessel. 

She has a comprehensive setup of military grade equipment throughout the boat. Every system has a failsafe full backup system. 

During 2020/21 she underwent an extensive refit to become a specialized expedition vessel. Key highlights of the refit included:

  • 18t of steel added to keel to improve stability
  • Purpose built great room for conferencing/dining/working
  • Expansive back deck for working and storage
  • Sun deck and helipad deck for additional amenities
  • Purpose built galley for long expeditions and gourmet food

IMMORTALIS is a long range expedition style yacht. The refurbished vessel marries modern contemporary style with glimpses into her former life as a scientific research vessel. The relaxed yet functional environment is available for guests to enjoy, relax and explore in tailor made fashion. 


Mariners Yacht & Ship Brokerage, Inc. is pleased to assist you in the purchase of this vessel. This boat is centrally listed by Denison Yachting.

Basic Boat Info

Make: Expedition
Model: Niigata
Year: 1996
Condition: Used
Category: Power
Construction: Steel
Boat Hull ID: CIYS-9135418
Has Hull ID: Yes


Length: 148 ft / 45.11 m
Length Overall: 147'6 ft / 44.96 m
Waterline Length: 128'4 ft / 39.11 m
Beam: 24'2 ft / 7.37 m
Max Draft: 10'4 ft / 3.15 m
Cabins Count: 6

Engines / Speed

Engines: 1
  • Make: Niigata
  • Model: 6MG25HX
  • Fuel: Diesel
  • Engine Power: 1,479hp
  • Engine Hours: 11992
Cruising Speed: 10 kn
Maximum Speed: 12 kn


Fuel Tanks: 1
Fuel Tank Capacity: 26,681 gal
Water Tanks: 1
Water Tank Capacity: 2,641 gal


Heads Count: 6
Boat Class: Motor Yachts



Fuel tank: 9 tanks, capacity 101.92 m3

Fresh Water Tank: 2 tanks, capacity 18.42 m3

Waste Oil: 1.96 m3

Black Water: 250l, 2600l



Main Engine: Niigata 6MG25HX 1500PS x 750rpm

Engine hours: 11,992 hours (May 2022)

Gearbox: Propulsion - 11,992 hours (May 2022)

Propeller: KAMOME 4 blades CPP-53AVCN-1

Bow thruster system: Bow thruster - KAMOME TCA30UN; Pump motor - Shinko CR-G



Micfil Ultra Fine Filtration system, containing:

Micfil bag filter BG400, water separator WS1000, quad

AL600 0.5 Micron, stainless steel quad manifold

Volumetric pump 4000 l/h

Water sensor monitoring



1. AquaPet SF-30N

LP SW pump Sanshin FOHM32A

LP SW pump motor Tayio TIF-71

2. ECH2 TRC 1800 Pro 4

LP SW pump WEG MARCH -0151-0039-1300



Water filtration system: UVBB - 3/SD/EPM Sterilization UV 57lt/min

FW electric heater: Harrison Co Ltd model 16 220 F6

Fresh water System: Kawamoto pump NF2K x2

Toilet system: Tecma silence plus 2G x9

Hydraulic System: 

Upper deck crane hydraulic control pump - Sumitomo turniger 422F

Upper deck crane hydraulic control pump - Shinko IRG

Aft deck crane hydraulic pump motor - Dezhou Hen Li Electric

Cathodic protection: Zinc anodes



Bilge OWS - Taiko USH03

Bilge OWS motor - Nidec Power FEQ

Bilge OWS pump - AIQ4257

Bilge pump - Japan MCQS-50

Bilge pump motor - Shinko CRQI-G



Hoses, fire extinguishers:

11 x Powder 9kg

3 x Foam 9kg

3x CO2 5kg

Fire Pro - fixed fire suppression system in engine room

Emergency fire pump on the aft deck



2 x Niigata 6NSF-G 250ps 1200rpm

Port hours 13,880 (May 2022)

Starboard hours 13,614 (May 2022)

Nippon Sharyo HO7DC

2 x Shinko TVLI GJ 603 



Surveillance cameras:

2x Hikvision Exir Fixed Dome Model DS-2CD2155FWD-I

5x Hikvision network camera model DS-2CD2063G0-1



4 x Samsung TV 32” (Guest rooms, crew area)

3 x Samsung TV 43” (Guest rooms)

1 x Samsung TV 82”(Great room)


Sound system:

SONOS 5.1.2 home theatre package with ARC (Great room)

SONOS one gen 2 speaker wireless (Sundeck)



Radar 1: Furuno Denki FAR-2107, RCU-014

Radar 2: Furuno DRS4D-NXT

Plotter 1: Furuno Denki GD-700

Plotter 2: Furuno Navnet TZ3, TZT19F

Multi Distributor for Data: Furono MD-550 (new, installed in May/June 2022)



Furuno F-170 AIS unit


EPIRB: Tron 60S 406mhz

GPS: Furuno GP-39 (new, installed in May/June 2022)

Sonar: Furuno FCV-1500L

Autopilot: Tokyo keiki PR-2604-SS/ Furuno Navpilot 711C

Gyro Compass: Tokyo keiki TG-6000

Magnetic Compass: Tokimec SH over 1 65A

Navtex: NCR-300A

MF/HF SSB Radio telephone: Samyung SRG-3150DN

Printer/Photocopy: Epson PX-M5041F



Furuno marine VHF radio FM-4800 +antenna CX4 (new, installed in May/June 2022)

2x JHS-32A

5x ICOM IC-M25


3x Motorola UHF


GSM – 4G: Peplink MAX HD 1

Wifi routers: 4x Ruckus 7372 (new) + 4 routers

Satellite phone with handset: Thuraya SatSleeve

LRIT/Inmarsat C: Cobham Sailor 3027 Mini-C Terminal, Sailor SSS add-on kit for 6110

incl. terminal Sailor 6194, alert and test buttons

Inboard Telephone System: OKI – Marine phone system



Main Power Supply:

3 AE producing 220V / 60hz

110VAC / 60hz

24V DC


Shore Connection: 3 phase 125-250amp

Shore Power Converter: Delta star 110KVA 3 PHASES 440V/400V/380V -> 220V 50/60HZ 3P

Engine Room battery chargers: 1 battery charger

House/Emergency battery chargers: 2 battery chargers

House/Emergency batteries: 2 battery banks

Radio batteries: 1 battery bank

Navigation lights: Standard navigation plus N.U.C. and R.A.M.

Deck Lights: 4x LED flood lights dimmable 220v / 200W

Underwater lights: 2x Bluefin LED MR20TH



Rational Self Cooking Center 5 Senses Model 61 Single Deck Combi

Oven - new

Commercial electric fryer (capacity 16l) - new

Commercial hot plate griddle HG-24 - new

Commercial hot plate stove Marinox HPO-4S-900 series - new

Glasswasher/dishwasher machine Reyco model GW-11l - new

Commercial ice maker Bayin / Pola model BY-100/200 - new

Commercial blender with sound cover - new

Philips rice cooker HD 3138 - new

Fire blanket - new

Freezer/refrigerator – Hoshizakidenki HRF-96PT

Tiger Professional rice cooker JNO- A270

Diamond drinking water filters – new


Storage boxes (25 pc, different sizes)


Galley cold store:

Compressor - Daikin 2C5825E-F

Compressor motor - Shinko CR-G

2x Freezer midea HS185CNK (aft deck storage)


Great room:

Diamond drinking water filters - new

2x wine/drinks fridges

water dispenser

Espresso machine – CIME CO-01 semi automatic

Eureka - Coffee grinder Mignon Manual



2x Laundry dryer 10.5kg Speed Queen

2x washing machine front load 10.5kg Speed Queen



Wet/dry vacuum, indoor vacuum



Life jackets: 25x SOLAS

Life rafts: 2x 25 person Youlong Rubber KHA-25 (surveyed April 2022)

First aid kit: 1x 25 person kit; 1x 5-10 person kit (tender)

Rescue tender: Primarily- Air Rider 7.5m tender; secondary- Zebec Armada 380


Other safety equipment:


2x Fireman suits Nomex Deva Original with breathing apparatus

4x perry buoy 2.5 kg

2x perry line 30m

6x safety torches

4x line thrower

4x smoke flares

12x parachute flares

4x hand flares

2x MOB smoke lifebuoy marker



Anchor system:

Anchor hydraulic winch pump - kawasaki screw B38-4L5FLTTD

Anchor winch motor - Shinko DR-G


Anchors: 2 x UIS type

Anchor Chain: Port 6 sections (164m), starboard 5 sections (138m)

Mooring Equipment: Bollards


Deck Crane:


2. HAOYO C-F3-10S3 SWL 4.5t @4m 1.5t @10m


Swim Ladder: Stainless steel

Fenders: 14 x F11



Surfboard racks

Fridge for drinks

Cooler sportsman 120QT

Bean bags 3x floating, 3x sitting bags

Air pump (storage room)



Fan cooling bar refrigerator 2 Door SS

4x sofa bean bags

2x sunlounges



Compressor: Bauer PE250-TE 220Volt-60hz; 225 bar with P21 separator

Filter: Paramina P61 XL with wall bracket

Air distribution Network: 2 x Bauer filling whips, 2 x filling hoses 10m, 2 x filling adapter


Dive sets: 

2 x Mares – abyss 22X regulator, rover octopus, mission 1, BCD

F-light, Rover mask and snorkel, X3 fin open heels, low cut booties

2mm, weight belt with s/s buckles, 2x2LBS lead weight, 1x2LBS soft weight

80 CUFT Tank: 6 x 80 CUFT Tank aluminium extra



Fishing: 11 rods and reels

Standup paddle board

Resistance bands and Olympic rings



May 2020@Sensei CO. Ltd Shimonoseki Factory:

Service and measurement of propeller and rudder shaft

Ultrasonic thickness measurement of the hull




Drydock in Citra Oct/Nov’20:

Installation of additional generator

Installation of additional water maker

New ballast keel plate 16T

Installation of additional transducer eco sounder

Hull blasting/washing/painting (3 layers incl antifouling)

Ship marking

Rudder blades – scraping, HP washing (3000 Psi), blasting and painting

Installation of swim platform


BBS (June 2020-December 2021)

Crew cabins: new frame up, cables, sockets, flooring, ceiling, walls, insulation, entry doors, ducting

Crew mess room: new frame up, cables, sockets, flooring, ceiling, walls, insulation, installation of table and sofa

Crew mess bathroom: new piping, drains, washing machines and dryers, framing, lightings, ceiling, walls

Guest cabins: new frame up, cables, sockets, flooring, ceiling, walls, insulation, lighting, entry doors, ducting, furniture, mattresses. New TV’s and telephone system

Guest cabins bathrooms: new piping, toilet, shower, floor, drains, tiles, glass panel, taps, lights, ducting

Camera room and hallways: remove taps and fitting from the wall, box up wall leading to bathroom, fit toilet power, flooring, walls, lighting, fit table for camera room, staircase handrails, cables, sockets, telephone system, fire system

Entry toilets and shower: new toilets, tiles, walls lighting

Storerooms fwd galley: change of lighting, new flooring painting, installation of accumulator and transformer

Galley: install new oven and dishwasher, new walls, flooring, ceiling, overhead exhaust fan, double sink, fire doors

Bridge deck - vent for ensuite cabin, overhaul of the old crane

Aft deck: bulwark completion cut off and replace the hatches, box cover for batteries, new floor for fish room, staircase to upper deck, new bollards, stainless steel railings, timber flooring

Installation of new crane pedestal and the crane

Installation of new desal including LP pump

Great Room - fabrication, installation, incl. removal of existing structure behind wheelhouse, bathroom for GR, new AC’s, lighting, floor, glass and internal fit out

Sundeck: installation, painting, new windows, railings, monkey deck, scuppers, louvers, lighting, ventilation, bar area, teak flooring

Mezz deck fabrication and installation incl glass, lighting stairs to bridge deck, tender tie down points

Mast: reinstalling equipment on new mast


The Company offers the details of this vessel in good faith but cannot guarantee or warrant the accuracy of this information nor warrant the condition of the vessel. A buyer should instruct his agents, or his surveyors, to investigate such details as the buyer desires validated. Hours listed may vary from actual hours due to recent use. Purchaser is encouraged to verify hours prior to purchase. This vessel is offered subject to prior sale, price change, or withdrawal without notice.

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