Exhibit 99.1 Oceaneering Reports First Quarter 2024 Results HOUSTON, April 24, 2024 – Oceaneering International, Inc. ("Oceaneering") (NYSE:OII) today reported net income of 15.1million,or0.15 per share, on revenue of 599millionforthethreemonthsendedMarch31,2024.Adjustednetincomewas13.9 million, or 0.14pershare,reflectingthepositiveimpactof(2.2) million in foreign exchange gains, and the associated 0.8millionoftaxeffects,alongwith0.2 million of expenses related to dis ...