The waters of the oceans and seas are filled with pulsating gas microbubbles. In this water may be formed the physical bodies (quasielastic body), which consist of the pulsating gas microbubbles. This quasielastic body is capable of emitting light and a pressure wave, which is capable of damaging the vessel in a collision.
The crew of the vessel under the influence of electromagnetic and infrasonic radiation of such a physical body may feel malaise, headache, dizziness, nausea, anxiety, weakness and visions, caused by hallucinations.
Electromagnetic radiation of such a physical body is capable of affecting the electrical engineering equipment of vessels.
This possibility is outlined in the article: "Unidentified Submerged Object (Anomalous Phenomena in the Ocean.)" by Nataliya Anatolievna Solodovnik and Anatoliy Borisovich Solodovnik.