A drilling and blasting vessel is a highly specialized marine platform designed to perform rock excavation work in offshore and nearshore environments. Its primary function is to drill precise blast holes in subsea rock formations and carry out controlled underwater blasting to achieve required seabed levels or trench profiles. These vessels are widely used in port construction, navigation channel deepening, subsea pipeline and cable routes, as well as foundation preparation for offshore structures such as bridges and energy installations.The vessel is typically equipped with one or more heavy-duty drilling rigs mounted on a stable platform. These rigs can operate in a wide range of water depths, usually supported by spuds, anchoring systems, or dynamic positioning, depending on the working environment and project requirements. Modern drilling systems are capable of penetrating hard rock with high accuracy, using advanced guidance and monitoring technology to ensure that hole positions, diameters, depths, and inclination angles conform to engineering specifications.Onboard equipment often includes compressors, hydraulic power units, high-capacity winches, and automated rod handling systems. The overall layout is designed to support efficient drilling cycles, safe handling of explosives, and smooth material logistics. Safety is a critical aspect of vessel design and operation. Dedicated magazines and storage rooms are arranged for explosive materials, complying with strict international and local regulations. Access control, fire protection systems, gas detection, and blast-resistant structural arrangements are commonly integrated into the vessel’s safety framework.The blasting process at sea must be carefully engineered and controlled. Detailed blast designs are prepared based on geological investigations, including rock strength, stratification, and the proximity of existing structures or utilities. Computer-aided blast modeling helps predict fragmentation, ground vibration, and underwater overpressure. On site, explosives are loaded into drilled holes by trained personnel, following standardized procedures. Initiation systems use reliable detonators and timing sequences, allowing precise control over the blast pattern and energy distribution. The goal is to achieve optimal rock breakage while minimizing environmental impact, vibration, and risk to nearby infrastructure.Environmental and regulatory considerations play an important role. Operations are usually planned around restrictions related to marine life, fisheries, and shipping traffic. Measures such as soft-start procedures, exclusion zones, real-time monitoring of vibration and noise, and use of bubble curtains or other mitigation technologies may be implemented. Sediment dispersion and water quality are also monitored, especially in environmentally sensitive regions.In addition to core drilling and blasting capabilities, these vessels often support integrated marine construction activities. They may work in combination with dredgers, grab barges, and rock dumping units to remove blasted material and shape the seabed. Modern control systems and data logging tools record key operational parameters, which aids in quality assurance, progress tracking, and future optimization. Through the combination of robust engineering, advanced technology, and strict safety management, drilling and blasting vessels provide an efficient and reliable solution for challenging rock excavation tasks in marine environments.