RedactedNarrative: On 6/18/2022, subject was operating his brothers vessel near Hidden Shores and the Imperial Dam. For unknown reasons, he struck a large floating object holding a sign. Due to the collision, the vessel started taking on water. However, they were unable to make it to land and the vessel sank in the entrance to Squaw Lake. I could not see the vessel where it had sank due to the water being murky and dark. During the contact with operator, I observed no odors of alcohol. I advised him and the owner of the vessel, they would have to remove the vessel from the water and they stated they would. I followed up at a later date and found out it was removed from the water. No injuries were reported.