Underwater Diving Operations

Underwater Welding and Leakage Arresting –
Vedanta Limited, Aluminium & Power-
Jharsuguda Odisha (2023- Till date)

Sea Lion Offshore Diving Pvt. Ltd. successfully executed specialized underwater welding and leakage arresting operations for Vedanta’s power plant in Odisha. The project involved the critical task of arresting leakage in the main water pipeline, which is vital for the plant’s continuous and efficient operation. Our expert team carried out precision welding of box clamps, standard clamps, and doubler plates directly onto the submerged pipeline, restoring its structural integrity and ensuring long-term operational reliability.

Our advanced techniques and stringent safety protocols enabled us to deliver a durable solution in challenging underwater conditions, demonstrating our capability in high-risk industrial maintenance projects.

Underwater Videography Inspection – 36-inch
Subsea Crude Pipeline-HPCL-Visakhapatnam
(2022 to till date).

Sea Lion Offshore Diving Pvt Ltd conducted a detailed underwater videography inspection of the 36-inch subsea crude pipeline, extending from OSTT (Offshore Tanker Terminal) to the Trestle Bridge.

Our expert team carried out a thorough visual assessment, providing high-resolution video documentation along with an accurate and comprehensive report on the pipeline’s condition. The inspection focused on detecting leakages, assessing the structural integrity, and evaluating potential risks to ensure the safe and reliable operation of the pipeline.

This service reflects our precision in underwater inspection techniques, critical for the maintenance and operational safety of subsea infrastructure in the oil and gas sector.

Kaleshwaram Lift Irrigation Project-KLIP (2019 to till date)

Sea Lion Offshore Diving Pvt. Ltd. played a critical role in the Kaleshwaram Lift Irrigation Project (KLIP)—one of India’s largest multi-stage lift irrigation systems—by providing specialized diving support services.

Scope of Underwater Operations:

We were engaged in a wide range of complex underwater tasks including:

•   Underwater Cutting, Underwater Welding
•   Underwater Chipping, Underwater Drilling
•   Underwater Concrete Works,
•   De-silting Activities
•   Caulking of Draft Tubes and Head Regulator Gates

These operations were pivotal to the successful commissioning and long-term operability of KLIP’s water infrastructure systems.

Kaleshwaram Lift Irrigation Project-KLIP (2019 to till date)

Government Collaboration:

We are proud to have collaborated with the Telangana State Government, under the dynamic leadership of Shri. Nalla Venkateshwarlu and guidance of State Advisor Shri. Pentareddy, to execute mission-critical diving tasks in record time.

Infrastructure Commissioned:

Our technical team contributed to the successful commissioning of:

•   All 22 Major Pump Houses under KLIP
•   Numerous Auxiliary Pump Houses
•   Flood Flow Canals
•   Associated Reservoirs and Dams

Partnered Companies:

We executed underwater and structural services for several leading infrastructure firms:

•   Megha Engineering & Infrastructures Ltd (MEIL)
•   BEKEM Infra Projects, Navayuga Engineering Company Ltd
•   WPIL Ltd, MRKRK Infra
•   Prathima Constructions, Sarala Projects

Underwater Gate Replacement – Nagarjuna Sagar Left Bank Power House (2017)

The work involved the removal of 540 trash rack gates, originally installed in 1967, at depths reaching up to 40 meters. The project required specialized underwater operations such as chipping, cutting, salvaging, clamping, and precision welding, followed by the installation of 540 brand-new gates to restore the operational efficiency of the power house. Despite extreme underwater working conditions, the entire project was successfully completed in a record time of just five months, delivering a reliable, long-term solution that enhanced both the performance and safety of the Nagarjuna Sagar Left Bank Power House.

This project stands as a testament to our expertise in executing large-scale underwater infrastructure challenges with precision, efficiency, and strict adherence to safety standards.

Advanced Marine Maintenance – Hull Cleaning using Cavitation Technology (2022 to till date)

In a strategic joint venture with Russian Cavitation Technology, our company has introduced Controlled Cavitation Hull Cleaning Services—a cutting-edge solution designed to safely and efficiently remove barnacles, algae, and bio-slime from vessel hulls without compromising their protective coatings or paintwork.

This technology leverages precisely controlled cavitation to deliver high-impact cleaning power while maintaining the structural and surface integrity of marine vessels. It is especially beneficial for:

•   Commercial Shipping Fleets
•   Indian Navy Vessels

Underwater videography of Plunge Pool-NSRS Srisailam Dam (June-2025)

Plunge Pool:

The work includes detailed underwater CCTV-based videography and photography between depths of 2.0 meters and 49.0 meters, covering an area of 2,500 square meters. A thorough visual inspection of 62 steel cylinders was carried out to assess any potential damage, followed by the preparation and delivery of a comprehensive structural condition report to support preventive maintenance planning.

The operation was executed using high-definition CCTV systems, diver communication systems, and specialized underwater documentation tools to ensure accuracy and reliability of the findings.

Underwater videography of Damaged weir at Srisailam ( June 2022)

Underwater Live Videography – Krishna River Weir Dam (Downstream of Srisailam Dam)

During heavy floods in the Krishna River, a section of the weir dam located downstream of the Srisailam Dam was washed away, creating an urgent need for accurate assessment.

Sea Lion Offshore Diving Pvt Ltd deployed its expert diving team to perform underwater live videography at depths exceeding 40 meters.

Our high-resolution real-time video survey provided critical visual data of the damaged structure, enabling the TGGENCO authorities to assess the situation accurately and plan effective remedial measures.

This project demonstrates our advanced underwater inspection capabilities, supporting key decision-making during high-risk infrastructure emergencies.

Underwater Cutting of Dam Gate – Pulichinthala Dam, Andhra Pradesh (2022)

During severe floods, the radial gate of Pulichinthala Dam was washed away, posing significant operational and safety challenges.

Sea Lion Offshore Diving Pvt Ltd carried out specialized underwater cutting operations, safely cutting the damaged dam gate into manageable sections at significant depth under complex conditions.

The dismantled gate pieces were carefully recovered and handed over to the Irrigation Department for further action.

Underwater Services – NTPC Simhadri Power Plant (2016 – 2023)

•   Gate sealing to ensure optimal operational integrity
•   Underwater cutting for maintenance and repair
•   Ash dyke de-silting to maintain storage efficiency
•   Cleaning of STG-1 AWRC sump suction pipeline.
•   Dewatering operations to facilitate safe and efficient repairs
•   Inspection and checking of submerged pumps to ensure reliable performance

Our consistent and high-quality service delivery has contributed to the smooth and uninterrupted operation of NTPC Simhadri, under challenging underwater conditions, adhering to the highest standards of safety and precision.

Retrieval of Torpedo for NSTL at Nagarjuna Sagar Upstream (2005)

The Naval Science and Technological Laboratory (NSTL) successfully launched a torpedo for testing in the waters of Nagarjuna Sagar upstream.

Sea Lion Offshore Diving Pvt. Ltd. was engaged to conduct an underwater search operation at depths of up to 40 meters.

The team located the torpedo, rigged it for safe surfacing, and recovered it successfully. Following recovery, the torpedo was handed over to the NSTL authorities for further analysis and processing.