WHAT WE KNOW: THE VESSEL’S SPECIFICATIONS
Pulling together the confirmed technical data from official statements and historical records:
| Specification | Detail |
|---|---|
| Built | 1939, Ferguson Brothers, Port Glasgow, Scotland |
| Type | Twin-screw passenger/general cargo vessel |
| IMO Number | 5036896 |
| Length (LOA) | 125 ft 9 in (38.33 metres) |
| Beam | 29 ft (8.84 metres) |
| Propulsion | Two 6-cylinder engines, 180–200 bhp each |
| Cruising Speed | 8.5 knots |
| Licensed passenger capacity | 394–397 passengers |
| Licensed cargo capacity | 284 tonnes |
| Last dry-dock | 2024 |
| Age at sinking | 87 years |
The MARAD Director General noted that when the vessel carries full passengers (394) it can carry 126 tonnes of cargo and when it carries fewer passengers, the weight allowance shifts, allowing more cargo up to 284 tonnes. This is the combined weight envelope the vessel does not have a fixed cargo limit independent of its passenger load. It has a total deadweight limit shared between people and cargo. News Source Guyana
THE LOAD LINE — UNDERSTANDING WHAT IT MEANS
The load line, or Plimsoll mark, is the single most important safety marking on any cargo or passenger vessel. It marks the maximum depth to which a vessel may be legally loaded under specific seasonal and geographic conditions. It is stamped on the hull amidships, the midpoint of the vessel’s length as a series of horizontal lines projecting from a central circle. The marks from top to bottom are:
- F — Fresh Water (least dense, vessel sinks deepest)
- T — Tropical Salt Water
- S — Summer Salt Water (the primary reference mark)
- W — Winter Salt Water
- WNA — Winter North Atlantic (most conservative; highest freeboard required)
When the waterline on the hull reaches or passes the relevant mark, the vessel is at its legal maximum load for that condition. Going beyond it is illegal and dangerous. The freeboard; the distance from the waterline to the main deck is your safety margin against waves washing over the deck.
THE LOAD LINE CALCULATION FOR MV BARIMA
The Barima’s exact official draught and freeboard figures have not been publicly released by MARAD or the Transport and Harbours Department. However, using confirmed dimensions, naval architecture principles, and official statements, we can construct a credible engineering estimate.
Step 1 — Estimating the Vessel’s Displacement
For a coastal passenger-cargo vessel of 1939-era construction with:
- Length (L) = 38.33 metres
- Beam (B) = 8.84 metres
- Estimated moulded depth (D) = approximately 3.0 metres (typical for this class)
- Block coefficient (Cb) = approximately 0.58 (moderate full form, typical of this vessel type)
- Estimated design draught = approximately 2.4–2.6 metres
Estimated volume of displacement at full load:
V = L × B × d × Cb
V = 38.33 × 8.84 × 2.5 × 0.58
V ≈ 491 cubic metres
Displacement at full load (seawater, density 1.025 t/m³):
Δ = 491 × 1.025 ≈ 503 tonnes
Step 2 — Estimating Lightship Weight
For a steel-hulled twin-screw vessel of this era and size, lightship weight (the weight of the vessel itself with no cargo, fuel, or people) would typically be:
- Hull steel: approximately 150–180 tonnes
- Machinery (two engines, gearboxes, shafting, propellers): approximately 30–40 tonnes
- Outfit (deck fittings, equipment, lifesaving appliances): approximately 15–20 tonnes
- Estimated lightship: 200–240 tonnes
Step 3 — Deadweight Tonnage (DWT)
DWT = Full load displacement − Lightship weight
DWT = 503 − 220 (midpoint estimate) = approximately 283 tonnes
This is remarkably consistent with the officially licensed cargo capacity of 284 tonnes, which confirms our estimates are well-calibrated. The DWT covers cargo + fuel + water + crew + passengers + stores. This means the 284 tonnes is not just cargo , it is the total available payload envelope.
Step 4 — What Was Actually Carried on the Final Voyage
| Load Item | Weight |
|---|---|
| Cargo (manifested) | 268 tonnes |
| Passengers (116 × 75 kg average) | 8.7 tonnes |
| Crew (17 × 80 kg average) | 1.4 tonnes |
| Fuel (coastal voyage estimate) | 4–6 tonnes |
| Fresh water and provisions | 2–3 tonnes |
| Vehicles (unquantified) | Unknown |
| Total minimum payload | ~284–287 tonnes |
This is critical. Even before accounting for the vehicles on board, the total payload at departure using conservative average weights was already at or beyond the vessel’s DWT of 284 tonnes. The cargo manifest figure of 268 tonnes does not include the weight of living people or fuel. When you add those in, the vessel was effectively at or past its load line before a single vehicle is counted.
HOW FAR UP THE LOAD LINE: THE ACTUAL CALCULATION
Tonnes Per Centimetre Immersion (TPC)
TPC tells you how many tonnes of additional weight sinks a vessel one centimetre deeper:
Waterplane area (Aw) = L × B × Cw (waterplane coefficient, approx 0.78 for this hull form)
Aw = 38.33 × 8.84 × 0.78 = 264 m²
TPC = (Aw × 1.025) / 100 = 2.71 tonnes per centimetre
Freeboard at Full Cargo (284 tonnes cargo only; ignoring people and fuel)
At 268 tonnes cargo the MARAD DG confirmed the load line was “just submerged.” Adding the remaining 16 tonnes to reach full 284-tonne cargo capacity:
Additional sinkage = 16 tonnes ÷ 2.71 TPC = 5.9 centimetres (approximately 6 cm)
So at official full cargo capacity of 284 tonnes , not counting the 179 people and fuel, the load line would sit approximately 6 centimetres below the waterline.
But the real picture is worse. Adding passengers, crew, and fuel:
Total payload beyond 268 tonnes cargo = 8.7 + 1.4 + 5 (fuel) = ~15 additional tonnes already on board, plus vehicles (unweighed).
Total effective sinkage below load line = (16 + 15) ÷ 2.71 = ~11.4 cm below the load line in salt water.
In fresh water (loading at the Demerara River wharf), the Fresh Water Allowance (FWA) would add another 4–5 cm of submersion, meaning the vessel’s load line could have been 15–16 centimetres below the waterline at departure from Georgetown.
THE FRESH WATER ALLOWANCE — THE DETAIL MARAD GLOSSED OVER
The MARAD Director General explained that “the load line was just submerged which is usual because when it go in the sea water it will be floating higher because of the denseness.” News Source Guyana
He is technically correct about the principle; vessels loaded in fresh water do rise when they enter salt water. But this statement deserves careful scrutiny, because it is being used to suggest the vessel was within limits when the numbers suggest otherwise.
The Fresh Water Allowance for this vessel (using standard formula FWA = Displacement ÷ [4 × TPC]):
FWA = 503 ÷ (4 × 2.71) = 503 ÷ 10.84 ≈ 46 mm = 4.6 centimetres
This means the vessel is legitimately permitted to have its load line submerged by up to 4.6 cm when loading in fresh water — because it will rise by that amount on entering seawater. That is standard practice and the DG is correct about it.
But here is the problem. The estimated total submersion at departure was 15–16 cm more than three times the FWA. The vessel would have risen by 4.6 cm on reaching coastal salt water, leaving the load line still approximately 10–12 centimetres below the waterline; the equivalent of roughly four Plimsoll mark spacings past the legal limit.
WHAT THIS MEANS FOR STABILITY
Every centimetre the load line submerges represents more than just weight, it represents a reduction in freeboard, which is your reserve buoyancy. For a 1939-era vessel with an elevated wheelhouse and superstructure carrying vehicles on deck, that reduction in freeboard has a compounding effect on stability:
Metacentric Height (GM) the measure of a vessel’s tendency to return upright after rolling is critically affected by how high cargo is stacked and where weight sits. The MARAD DG admitted he had “no record of how the weight was distributed at the top or the bottom” of the vessel. Vehicles parked on the upper deck raise the centre of gravity dramatically. A raised centre of gravity reduces GM. A reduced GM means the vessel takes longer to recover from a roll and in rough seas, a vessel with low GM may not recover at all. News Source Guyana
The Demerara Waves noted that the vessel was never built for the vehicles and building materials and full commercial loads that a growing economy demands of her. She was built for the cargo, the crowds, and the unhurried tempo of British Guiana in 1939. Demerarawaves
THE BOTTOM LINE
At its official full cargo capacity of 284 tonnes not counting passengers, crew, fuel, or vehicles the MV Barima’s load line would have sat approximately 6 centimetres below the waterline in salt water. That alone puts it at its legal maximum.
When you add the full weight of 179 people, fuel, water, and unweighed vehicles the actual total payload on the night of July 18, 2026 the vessel was almost certainly sailing with its load line 10 to 12 centimetres submerged in coastal waters, with its freeboard correspondingly reduced, and its stability compromised by vehicle weight on deck, a 1939 hull form never designed for modern commercial loading, and a night-time crossing of open coastal water.
A vessel can be “within her limits” on paper and still be the wrong vessel for the sea she crosses and a system can meet every one of its own low standards and still put a boat older than most of our grandparents into waters she was never built to survive. Demerarawaves
The load line tells you where the water should stop. On the MV Barima’s last voyage, the water did not stop there.
Source: Guyana1news.com
