Subsea works, underwater UXO clearance and hyperbaric operations.
SEMTEC, the subsea subsidiary of DEMINETEC Group, brings underwater inspection, marine UXO clearance and hyperbaric works expertise to the port and industrial community of Jakarta (Indonesia). Our Class II commercial divers — certified under French Decree 2011-45 (hyperbaric class B) and trained to NEDEX/EOD standards — operate on harbours, marine structures, ships' hulls and coastal areas contaminated by 20th-century conflicts.
Jakarta — then Batavia — was occupied by Imperial Japanese forces from March 1942 to August 1945. The Battle of the Java Sea (February 1942), Allied air raids in 1944-1945 and the Indonesian War of Independence (1945-1949) against Dutch forces left a significant unexploded-ordnance legacy in the harbour of Tanjung Priok, the former Dutch military estates and along the Java Sea coast.
Indonesia's vast EEZ contains numerous WWII naval wrecks loaded with ordnance — including HMS Exeter, HMS Encounter, HMNLS De Ruyter, HMNLS Java and several Japanese transports — which remain documented underwater UXO hazards. Indonesian Navy EOD units (Dinas Penyelaman Bawah Air, Yon Taifib) handle clearance in territorial waters.
Jakarta's mega-projects — MRT North-South Line phase 2, LRT extensions, the planned capital relocation to Nusantara in East Kalimantan, Patimban deep-sea port, offshore oil and gas projects (Sakakemang, Tangguh) — increasingly require UXO desk studies and underwater magnetometric surveys aligned with IMAS standards and French Decree 2005-1325.
In-water survey by qualified divers, ultrasonic thickness through paint, 3D photogrammetry, IACS-class survey report for calls at Jakarta.
Magnetometer and gradiometer survey, target identification, controlled neutralisation or recovery in coordination with local authorities.
Wet welding, oxy-arc cutting, underwater concreting, sheet-pile and quay repair.
Refloating of sunken vessels, recovery of submerged plant, crane-assisted lifting operations.
On-site recompression chamber deployment, compliant with French Decree 2011-45 and IMCA D guidance.
In the strategic port of Jakarta, SEMTEC mobilises divers, observation ROVs and marine magnetometers to secure basins, jetties, approach channels and anchorages where 20th-century munitions still routinely lie on the seabed.
SEMTEC operates in Jakarta and across Indonesia from our French bases at La Seyne-sur-Mer (Var) and Wancourt (Pas-de-Calais), our Belgian office in Bruges and our Ukrainian site in Kyiv. Diving spread and naval logistics are mobilised on demand.
Depending on Indonesia's history, port seabeds typically conceal sea mines (German EMC, British Mark XVII), submerged aerial bombs (250 kg–500 kg), torpedoes, large-calibre naval shells and depth charges. The preliminary EHT pinpoints the expected typology for Jakarta.
Our Class II hyperbaric-class-B divers work to 50 m on air, and we coordinate longer-duration tasks down to 90 m through saturation partners. Observation ROVs extend reconnaissance to 300 m.
A standard UWILD/IWS on a commercial vessel takes 8–24 dive hours depending on hull length, complexity, coating condition and class requirements. SEMTEC issues the class report within 5 days.
Decree 2011-45 governs hyperbaric work in France. Internationally, SEMTEC uses it as a benchmark alongside IMCA D standards and the local regulations applicable in Indonesia.
The Port of Tanjung Priok is a coastal breakwater at Tanjung Priok, North Jakarta, Indonesia. It is operated by Indonesian state-owned PT Pelindo and owned by PT Pelabuhan Indonesia. The port handles more than 50% of Indonesia’s trans-shipment cargo traffic and has 20 terminals for general cargo, multipurpose operations, scraps, passengers, dry bulk, liquid bulk, oil, chemicals and containers. Specialised facilities serve oil tankers, chemical-laden ships, metal scrap and passengers. The port has 76 berths, a quay length of 16,853 metres, a total storage area of 661,822 square metres and storage capacity of 401,468 tonnes. It loaded and unloaded 6.2 million TEUs in 2016, 6.92 million TEUs in 2017 and 7.8 million TEUs in 2018, against total capacity of about 8 million TEUs.
The Jakarta International Container Terminal is operated by Hutchison Port Holdings and Pelindo and is Indonesia’s largest container terminal and national hub port. The New Priok extension, also known as Kalibaru Port, is designed to increase annual capacity from five million to 18 million TEUs and accommodate triple-E class container ships with an 18,000-TEU capacity through a 300-metre-wide two-way sea lane. NPT 1 has eight cranes handling 30 containers per hour, berths for ships with drafts up to 16 metres and capacity for ships up to 15,000 TEUs. Its land area is 32 hectares and dock length is 450 metres. Marunda Port has three planned piers with a combined length of 5,350 metres.
Tanjung Priok is a coastal breakwater port with intensive vessel and cargo operations, including containers, liquid bulk, oil, chemicals, dry bulk, scraps and passengers. Congestion and slow customs handling previously affected port performance, with turnaround times six times those of Singapore. New Priok berths accommodate vessels with drafts up to 16 metres, while its sea lane is 300 metres wide and designed for two-way traffic. Marunda is being developed for bulk handling, with projected capacity of 30 to 35 million tons per year from 50 ships.
The Port of Tanjung Priok is operated by Indonesian state-owned PT Pelindo and owned by PT Pelabuhan Indonesia. Its Jakarta International Container Terminal is operated by Hutchison Port Holdings and Pelindo. The port is located at Tanjung Priok in North Jakarta and has the UN/LOCODE ID TPP.
The port has 20 terminals covering general cargo, multipurpose operations, scraps, passengers, dry bulk, liquid bulk, oil, chemicals and containers. Specialised facilities cater to oil tankers, chemical-laden ships, metal scrap and passengers. The port also has 76 berths, a 16,853-metre quay and extensive storage areas.
The New Priok extension, also called Kalibaru Port, is designed to increase annual container capacity from five million to 18 million TEUs. Its NPT 1 terminal has eight cranes, handles 30 containers per hour, accommodates vessels with drafts up to 16 metres and can serve container ships carrying up to 15,000 TEUs.
Reference : Wikipédia — Port of Jakarta
For any survey, inspection or subsea intervention in Jakarta, contact our teams:
Tel: +33 (0)9 52 51 00 63
Email: contact@semtec-france.com
Read also: underwater UXO clearance · commercial diving services · offshore subsea works.