Sunil Humor Sahu, Shipwright Artificer, a sailor posted at INS Kattabomman in Tirunelveli, Tamil Nadu, had in two written complaints on October 13 and October 2 made allegations of financial irregularities against his superior officers.
A three-member BOI, which is headed by a Commodore-rank officer, is expected to submit its findings in a fortnight, a statement released by the Navy said.
Sahu has been carrying out non-strenuous duties as he suffers from generalized seizures and low backache, it said.
"On a request from the sailor, his family has been permitted to accompany him to the hospital, as a special case," the statement said.