01 — Vessel

Pilot plus two observers. 300 msw.

Yellow work hull. Forward acrylic viewport, low conning position, main and vertical thrusters, keel battery pods. One-atmosphere cabin. Built for film, research, tourism, or expedition.

Designation

SM300-3

Name

Plinio Seniore

Builder

Global Submarines Oy Ltd

Class

DNV +1A1 Sub III

Depth

300 msw

Occupancy

1 pilot + 2 observers

Location

South Florida

Spares

Triple kit, oil-packed

02 — Certification and logs

DNV +1A1 Sub III

Classification file, dive logs, and maintenance history go with the hull. Dates, depths, crew, defects, close-out.

• DNV stamp on pressure hull, viewports, and life-support loop.
• Operational logs with the boat.
• Maintenance history keyed to the triple spare inventory.

03 — Triple spare kit

Three of every critical part. Brand new. Oil-packed.

Three complete sets of critical system spares — brand new, oil-packed, drummed, sealed, wax paper. Built for work away from a support shop. The boat ships with the kit.

• Pressure hull & hatch

  Viewport O-rings, hatch seats, penetrator glands, hull fasteners, anode sets

  × 3 SETS · OIL · DRUM · WAX

• Ballast & trim

  Sea valves, blow circuits, trim-pump rebuilds, strainers, actuator seals

  × 3 SETS · OIL · DRUM · WAX

• Propulsion

  Main and vertical thruster rebuild kits, bearings, props, controllers, glands

  × 3 SETS · OIL · DRUM · WAX

• Life support

  O₂ fittings, CO₂ scrubber charges, sensors, emergency bottles, cabin filters

  × 3 SETS · OIL · DRUM · WAX

• Electrical

  Connector sets, fuses, lighting, battery interconnects, telemetry spares

  × 3 SETS · OIL · DRUM · WAX

• Hydraulics / pneumatics

  Hoses, fittings, accumulators, regulators, preserved in oil

  × 3 SETS · OIL · DRUM · WAX

04 — Purchase and working lease

Monthly is the working term. Weekly if you need a short window.

Film, research, tourism, expedition. South Florida handover. The triple kit travels with the boat so a programme is not waiting on a parts order from Europe.

Purchase remains $895,000 complete. Lease rates below.

Mobilisation, transport, fuel, oxygen, CO₂ absorbent, and permits billed at cost. P&I stays on the mothership.

05 — Purchase comps

Asking $895,000. Used 300 m boats with thin spares sit lower.

New three-passenger 300-metre yacht subs list $3.8M–$5.7M. That is replacement cost. The SM300-3 sits in the certified used band — Perry, lockout hulls, complete DNV packages — with a triple oil-packed kit most used listings do not have.

Used-comp average $971,659

• SM300-3 Plinio Senioreasking

  Global Submarines Oy Ltd · DNV +1A1 Sub III · 300 msw · South Florida · 3 pax · 300 m

  This boat. Triple brand-new oil-packed spares, certification, and logs included. Deep Ranger 2-pax available separate or as a package.

  Owner offering, September 2026

  $895,000 ask

• Perry 3-man researchasking

  Perry Oceanographics · Used, 300 m / 1,000 ft class · 3 pax · 300 m

  One-atmosphere workboat with manipulator and sonar. Older commercial hull — closest industrial analogue, thin spares story.

  Maritime Sales listing (research sub, 1,000 ft / 12 t)

  $487,730

• Perry Antipodes (PC-1501)asking

  Perry / later operators · 1973 hull, rebuilt; 300 m · 5 pax · 300 m

  ABS-classed five-person lockout lineage. Larger occupancy, similar depth. No triple preservation package disclosed.

  Public 2023–26 brokerage coverage

  $795,000

• Perry diver lockoutasking

  Perry Oceanographics · 1973 / rebuilt 1995; 305 m · 5 pax · 305 m

  North Sea oil-field lockout sub. Commercial pedigree, five souls, eight-hour endurance.

  MySubmarines / Silvercrest circuit

  $1,000,000

• U-Boat Worx CE-5used

  U-Boat Worx · 2015, DNV-classed, with spares · 5 pax · 200 m

  Cleanest published used sale-adjacent ask with a spare-parts inventory. Shallower (200 m) but five-person and classed.

  YachtWorld, Breda listing

  €900,000 · ~$1.06M

• U-Boat Worx NEMO 2used

  U-Boat Worx · 2022, low hours · 2 pax · 100 m

  Newer luxury compact. Half the depth, one fewer soul. Late-model classed toy money at 100 m.

  Apollo Duck, U.S. West Coast

  €1,400,000

• Super Yacht Sub 3new

  U-Boat Worx · New / recent production · 3 pax · 300 m

  Direct 3-pax / 300 m spec match on a new luxury hull. Replacement-cost ceiling, not a substitute.

  TheArsenale retail

  $3.81M

• SEAmagine Aurora-3Cnew

  SEAmagine · New, ABS, 460 m · 3 pax · 460 m

  Deeper new-build three-person. Sets the replacement-cost cap for a 3-pax acrylic yacht sub.

  TheArsenale retail

  $4.18M

• U-Boat Worx Super Subnew

  U-Boat Worx · New, DNV, high-speed 300 m · 3 pax · 300 m

  Performance halo product. Prices desire, not a work hull.

  2023–26 Monaco / press (base from €5.2M)

  €5.2M · ~$5.7M

06 — Broker desk

Who actually sells a submarine

Monaco and Miami desks that work explorer yachts and submarine toys. Public switchboards and published inboxes. Copy a letter in my name and send it.

• Superyacht Tenders and Toys

  Josh Richardson, CEO · UK + Monaco

  Independent tenders-and-toys house. Lists submarines on the product sheet. Monaco office on rue du Castelleretto.

  +44 2380 016363 · Monaco +377 99 90 62 98 · [email protected]

  All enquiries: [email protected]. [email protected] published on the SuperYacht News directory.

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• Yacht Chandlers

  James James (U-Boat Worx USA) · Fort Lauderdale

  U-Boat Worx U.S. dealer. Fort Lauderdale HQ, daily runs to Miami, Antibes office covering Monaco.

  +1 954 761-3463 · Europe +33 4 93 33 98 21 · [email protected]

  [email protected] · [email protected] for Antibes/Monaco desk.

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• Ocean Independence

  Tim Quinlan, Senior Sales & Purchase

  U-Boat Worx sales partner. Fort Lauderdale office plus UK sales. Tim Quinlan is the published sub contact.

  +44 7341 127755 · [email protected]

  Email as published on the U-Boat Worx dealers page.

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• Brownie's Yacht Toys

  Fort Lauderdale · 2301 S Federal Hwy

  South Florida yacht-toy and dive house. Captains already call them for underwater kit.

  +1 954 463-9446 · [email protected]

  [email protected]

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• Burgess

  Miami 1450 Brickell · Monaco Port Hercule

  On the floor at Monaco 23–26 Sep and at Miami. Explorer and 60 m+ owners who actually carry a sub.

  Miami +1 305 672-0150 · Monaco +377 97 97 81 21

  No published Miami/Monaco sales inbox. Switchboard or burgessyachts.com enquiry form. Do not use the Australia address.

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• Fraser

  Fort Lauderdale · Monaco Quai Antoine 1er

  Largest full-service house. Fort Lauderdale and Monaco both work explorer inventory.

  Fort Lauderdale +1 954 463-0600 · Monaco +377 93 100 450 · [email protected]

  [email protected] published on SuperYacht Times.

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• Denison Yachting

  Fort Lauderdale 17th Street · Monaco Le Panorama

  Florida volume house with a Monaco office. Good reach into 24–50 m owners adding toys.

  Fort Lauderdale +1 954 763-3971 · Monaco +377 92 00 16 10 · [email protected]

  [email protected] published on the contact page.

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• IYC

  110 E Broward · Monaco Les Caravelles

  Fort Lauderdale HQ, Monaco on Blvd Albert 1er. Sales, charter, and new-build clients who specify tenders and toys.

  Fort Lauderdale +1 954 522-2323 · Monaco +377 97 98 24 24

  Use the office switchboard or iyc.com form. No current public sales inbox.

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• Northrop & Johnson

  Fort Lauderdale LMC · Monaco Le Panorama

  Lauderdale Marine Center HQ, Monaco office overlooking Port Hercule.

  Fort Lauderdale +1 954 522-3344 · Monaco +377 97 77 27 20

  Switchboard or northropandjohnson.com form.

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• Y.CO

  Monaco 17 Avenue Albert II · Fort Lauderdale

  Monaco HQ, Fort Lauderdale office. Explorer and expedition management clients.

  Monaco +377 93 50 12 12 · [email protected]

  [email protected] published on SuperYacht Times.

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• Edmiston

  Monte Carlo · Miami

  Monaco on Blvd Albert 1er, Miami office. Large-yacht sales that routinely spec a sub garage.

  Monaco +377 93 30 54 44

  Use edmiston.com enquiry. [email protected] is marketing, not sales — do not use it for this letter.

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• HMY Yachts

  Miami Beach Marina · Bahia Mar

  Miami Beach Marina desk plus Bahia Mar. Local for a South Florida viewing.

  Miami Beach +1 305 856-8486 · Bahia Mar +1 954 256-8322

  Office phones only. No published generic sales inbox.

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• Allied Marine

  1445 SE 16th St, Fort Lauderdale

  Ferretti Group Florida. 24–40 m motor-yacht clients adding a guest sub.

  +1 954 462-5557

  Fort Lauderdale switchboard. No published generic inbox.

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• International Yacht Brokers Association

  Fort Lauderdale

  The Fort Lauderdale trade body. Blast to member desks covering Miami and the winter circuit.

  · [email protected]

  [email protected] — association desk, not a selling broker.

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Subject: SM300-3 Plinio Seniore — DNV classed 3-pax sub, $895,000, South Florida

From: John Antaramian
President & Chief Engineer, SubSurface Submersibles · Atlantic Submarines

I have a DNV +1A1 Sub III three-passenger submersible for sale. Global Submarines Oy SM300-3, named Plinio Seniore. 300 msw. South Florida.

Asking $895,000 USD complete with three brand-new oil-packed spare kits, certification, and logs. Ready for survey, sea trial discussion, and shipment.

New 3-pax 300 m yacht subs list $3.8–5.7M. This is a working hull with a real parts locker, not a two-year new-build slot.

Deep Ranger 2-pax also here, separate or package.

If you have an explorer or owner who wants a sub on the yacht, I would rather you heard it from me than from a listing board. Call or write.

John