Robotics revenues increased $1.1 million, or 2%, during the first quarter 2024 compared to the first quarter 2023 primarily due to higher chartered vessel days and trenching and ROV activities during the current year. Chartered vessel days increased to 333 days during the first quarter 2024 compared to 295 days during the first quarter 2023, although chartered vessel days in the first quarter 2024 included approximately 64 days of standby utilization at reduced rates. Chartered vessel utilization was 74% during the first quarter 2024 compared to 91% during the first quarter 2023. ROV and trencher utilization increased to 58% during the first quarter 2024 compared to 56% during the first quarter 2023, and the first quarter 2024 included 85 days of integrated vessel trenching compared to 66 days during the first quarter 2023. Robotics operating income increased $0.4 million during the first quarter 2024 compared to the first quarter 2023 primarily due to higher revenues during the first quarter 2024.
Shallow Water Abandonment
Shallow Water Abandonment revenues decreased $35.1 million, or 57%, during the first quarter 2024 compared to the previous quarter. The decrease in revenues reflected seasonally lower utilization levels and an overall softer Gulf of Mexico shelf market across all asset classes. Overall vessel utilization was 41% during the first quarter 2024 compared to 72% during the prior quarter. Plug and Abandonment and Coiled Tubing systems achieved 626 days utilization, or 26%, during the first quarter 2024 compared to 1,386 days utilization, or 58%, during the prior quarter. The Epic Hedron heavy lift barge was idle during the first quarter 2024 compared to having 70 days utilization, or 76%, during the prior quarter. Shallow Water Abandonment operating income decreased $24.5 million during the first quarter 2024 compared to the prior quarter primarily due to lower revenue during the first quarter 2024.
Shallow Water Abandonment revenues decreased $22.5 million, or 46%, during the first quarter 2024 compared to the first quarter 2023. The decrease in revenues is due to lower activity levels that are reflective of the variable nature of operator spending as well as higher customer concentrations in the Gulf of Mexico shelf market, resulting in lower vessel and system utilization during the first quarter 2024 compared to the first quarter 2023. Overall vessel utilization was 41% during the first quarter 2024 compared to 58% during the first quarter 2023. Plug and Abandonment and Coiled Tubing systems achieved 626 days utilization, or 26% on 26 systems, during the first quarter 2024 compared to 1,277 days utilization, or 68% on 21 systems, during the first quarter 2023. The Epic Hedron heavy lift barge was idle during the first quarter 2024 compared to having 13 days utilization during the first quarter 2023. Shallow Water Abandonment operating income decreased $19.3 million during the first quarter 2024 compared to the first quarter 2023 primarily due to lower revenue during the first quarter 2024.
Production Facilities
Production Facilities revenues increased $4.8 million, or 25%, during the first quarter 2024 compared to the prior quarter primarily due to higher oil and gas production following the well workover completion on the Thunder Hawk wells early in the first quarter 2024, which had been shut-in during the entire fourth quarter 2023. Production Facilities incurred operating losses of $1.5 million during the first quarter 2024 compared to losses of $1.0 million during the previous quarter primarily due to workover costs on the Thunder Hawk wells of approximately $4.4 million higher than the prior quarter, offset in part by higher revenues during the first quarter 2024.
Production Facilities revenues increased $3.2 million, or 16%, during the first quarter 2024 compared to the first quarter 2023 primarily due to higher oil and gas production due to the Thunder Hawk wells being shut-in for planned maintenance during the first quarter 2023. Production Facilities incurred operating losses of $1.5 million during the first quarter 2024 compared to operating income of $5.2 million during the first quarter 2023 primarily due to well workover costs of approximately $8.6 million related to the Thunder Hawk wells during the first quarter 2024.
Selling, General and Administrative and Other
Share Repurchases
Share repurchases totaled approximately 0.5 million shares for $5.0 million, of which approximately $0.9 million was accrued at quarter-end.
Selling, General and Administrative
Selling, general and administrative expenses were $21.0 million, or 7.0% of revenue, during the first quarter 2024 compared to $23.0 million, or 6.9% of revenue, during the prior quarter. The decrease in expenses during the first quarter 2024 was primarily due to lower incentive compensation costs compared to the prior quarter.
Losses Related to Convertible Senior Notes
The loss of $20.9 million during the first quarter 2024 relates to the retirement of the remaining 2026 Notes.