The sightseeing boat that sank off the Shiretoko Peninsula in Hokkaido and fell to the seabed when it was carried by a work boat on the 24th was suspended by five belts to distribute the load, resulting in a load per boat. It turned out that the ship became lighter and the hull and belt seemed to have rubbed or lost balance and fell.
The salvage company plans to use two thicker belts to secure the hull so that the belts are fully loaded and then lift them again on the 26th.
In the accident where the tour boat "KAZU 1" sank off the coast of the Shiretoko Peninsula, the hull lifted from the seabed at a depth of about 120 meters was carried by a work boat while being suspended in the sea, but on the 24th. It fell to the seabed at a depth of 182 meters off the coast of Utoro Port in Shari Town.
According to the people concerned, the seabed that fell was sandy, and the hull remained in its original shape with the bottom down and slightly tilted to the left.
In addition, as a result of an investigation, the salvage company told the Japan Coast Guard that it is highly possible that two of the five nylon belts used for lifting were cut off on the stern side and the front handrail came off and fell. I found that I was reporting.
As a result of hanging with five belts to disperse the load on the hull, it is possible that the load per one became lighter and the hull and string rubbed or the balance was lost, and the broken belt. There are rubbing marks on the cross section of.
For this reason, the salvage company reduced the number of belts from five to two during the work on the 26th, making one thicker to increase strength, and fixing the hull so that a sufficient load is applied to one. The policy is to lift it again.
Belt on the hull with an underwater robot
On the 25th, the work of putting a belt on the hull submerged on the seabed by remote control using an underwater robot was carried out.
According to the officials of the Japan Coast Guard, at first, they dug the seabed in contact with the hull to make a hole, and then tried to put a belt through this hole.
The underwater robot can be replaced with various types of arms, and a shovel type arm was used, but because the seabed is sandy, it collapses even if it is dug and it is difficult to make a solid hole, so the method It means that I decided to change.
Replace it with an arm with five fingers on the left hand and an arm shaped to grab an object with the right hand, lift the stern and make a temporary stern as before, and put a belt on the space created between the bottom of the ship and the seabed in the evening. It means that the work is completed.