All SINKEXs are intended to terminate in water at least 6,000 feet and also at least 50 nautical miles offshore. It is that limitation, worse still than the explosions and fireballs, that makes what these events actually are: highly regulated, data-glutton, engineering experiments on the sea and not the wanton disposal of a ship.
The U.S. Navy has a process known as SINKEX or “sink at-sea live-fire training exercises” when a retired hull is used as a full-sized instrumented target. It is among the few instances during peace time when fleets can study, in actual sense, how steel really breaks up in case of missile hits, bomb attacks, gunfire and torpedo blasts. Simulators are able to duplicate tactics and schedules, however, the sloppy physics of flooding routes, gradual structural breakdown, shock impacts, and the inertialia of a ship that insists on remaining afloat even after the model claims it must evaporate, cannot be replicated.
It is an aspect, rather than a flaw, of that thing which declines to die. A hulk that takes several blows and slips under provides operators and engineers with something uncommon a series of measurable combat-like loads rather than a one-clean kill. The lessons take place in a number of directions simultaneously weapon fuzing and terminal effects, sensor-to-shooter coordination between ships and aircraft, and the design features that can then make a compartment a survivable box or a flooding conduit.
During Valiant Shield 24, the ex-USS Cleveland (LPD-7) was utilized as a target in the North Pacific, which was a significant attraction to those lessons. To Cleveland, the termination was also a last mission to decades of diversified work including the Vietnam-era and disaster-responding and counter-drug missions. A final chapter of a ship is in this type of exercise a controlled exercise of a new lethality into an old method of building, material, and design.
The environmental and safety mechanics are not something incidental; they determine the event as a whole. Under that, the Maritime Administration reports that, prior to a deep-water sinking, EPA and Navy define what hazardous materials should be removed, and they make sure the vessel sinks as soon as possible and remains on the seafloor, without becoming a navigation hazard, including using water at least 6,000 feet and 50 nautical miles off shore. An independent description that is facing the public about RIMPAC training gives an account of the strenuous cleaning operation, involving the extraction of liquid PCBs in transformers and big capacitors, in addition to rubbish, floatables, mercury or fluorocarbon materials, and petroleum remnants.
Nevertheless, SINKEX remains open to sustained criticism since “clean enough to sink to training” is not the same requirement as “clean enough to become an artificial reef”. Criticism of older ships has focused on the fact that older ships may harbor the persistent toxins within their structure, as seen in PCB leakage into the marine food web in a former carrier that had been intentionally reefed. The reason why SINKEX planning is inclined to stress the deep-water position and faster, permanent sinking can be explained by that tension: it minimizes the operational risk of navigating in the sea and minimizes the exposure pathways in the near shore as it maintains the value of training on a hull body.
A broader Pacific training ecosystem also connects SINKEX. Sinking exercises have been widely used in tests of weapons and interoperability in real world maritime conditions, with RIMPAC with over 40 countries being the largest international maritime warfare exercise in history. The spectacle is not the throughline spectacle is calibration. Navies have always required hard information on what the missiles to the ship do when they strike: what catches fire, what inundates, what continues, what dies, etc. in an age of fast changing anti-ship missiles and networked sensors, such information is always valuable.
A SINKEX in that respect is not so much about making a dramatic warning as it is about making the sort of physical truth that reforms designs, reforms the assumptions of damage-control, and refines the next live-fire plan prior to its becoming significant.
