Exhibit 99.1 Oceaneering Reports Third Quarter 2024 Results HOUSTON, October 23, 2024 – Oceaneering International, Inc. ("Oceaneering") (NYSE:OII) today reported net income of $41.2 million, or $0.40 per share, on revenue of $680 million for the three months ended September 30, 2024. Adjusted net income was $37.2 million, or $0.36 per share, reflecting the impact of $(0.4) million of pre-tax adjustments associated with foreign exchange gains recognized during the quarter, $0.6 million tax effect on adjustme ...