Robotics revenues increased $8.9 million, or 12%, during the third quarter 2024 compared to the third quarter 2023. The increase in revenues was due to higher vessel, trenching and ROV activities during the third quarter 2024. Chartered vessel activity increased to 532 days, or 96%, during the third quarter 2024 compared to 506 days, or 97%, during the third quarter 2023. Integrated vessel trenching decreased to 249 days during the third quarter 2024 compared to 276 days during the third quarter 2023, and the third quarter 2024 included 92 days utilization on the i-Plough trencher on a third-party vessel and 92 days utilization on the IROV boulder grab, whereas the i-Plough and IROV were idle during the third quarter 2023. Overall ROV and trencher utilization increased to 77% during the third quarter 2024 compared to 67% during the third quarter 2023. Robotics operating income increased $3.5 million during the third quarter 2024 compared to the third quarter 2023 primarily due to higher revenues during the third quarter 2024.
Shallow Water Abandonment
Shallow Water Abandonment revenues increased $20.8 million, or 41%, during the third quarter 2024 compared to the previous quarter. The increase in revenues was primarily due to an increase in vessel and heavy lift activity during the third quarter 2024. Vessel utilization (excluding heavy lift) increased to 76% during the third quarter 2024 compared to 58% during the prior quarter. The Epic Hedron heavy lift barge had 88% utilization during the third quarter 2024 compared to 46% during the prior quarter. Plug and Abandonment (P&A) and Coiled Tubing systems activity declined slightly to 607 days, or 25% utilization, during the third quarter 2024 compared to 632 days, or 27% utilization, during the prior quarter. These improvements during the third quarter were achieved despite the impacts of Hurricanes Francine and Helene in September 2024 that resulted in approximately 12 weather-related idle days, up to an estimated $10 million loss in revenue, during the quarter. Shallow Water Abandonment operating income improved $9.1 million during the third quarter 2024 compared to the prior quarter primarily due to higher revenues during the third quarter 2024.
Shallow Water Abandonment revenues decreased $15.7 million, or 18%, during the third quarter 2024 compared to the third quarter 2023 due to lower vessel and system utilization during the third quarter 2024. Revenue decreases were offset in part by higher pass-through revenues on the P&A systems compared to the third quarter 2023. Vessel utilization (excluding heavy lift) was 76% during the third quarter 2024 compared to 89% during the third quarter 2023. P&A and Coiled Tubing systems utilization declined to 607 days, or 25%, during the third quarter 2024 compared to 1,531 days utilization, or 74%, during the third quarter 2023. The Epic Hedron heavy lift barge had 88% utilization during the third quarter 2024 compared to 100% utilization during the third quarter 2023. Utilization rates for the segment during the third quarter 2024 reflect 12 weather-related idle days, up to an estimated $10 million loss in revenue, resulting from Hurricanes Francine and Helene. Shallow Water Abandonment operating income decreased $18.8 million during the third quarter 2024 compared to the third quarter 2023 primarily due to lower revenues, in addition to higher costs due to an increase in lower margin pass-through activities during the third quarter 2024.
Production Facilities
Production Facilities revenues decreased $4.7 million, or 19%, during the third quarter 2024 compared to the prior quarter primarily due to lower oil and gas production and prices during the third quarter. Oil and gas production declined due to an ongoing unplanned shut-in of the Thunder Hawk wells during most of the third quarter 2024. Production Facilities operating income decreased $0.8 million during the third quarter 2024 compared to the prior quarter primarily due to lower oil and gas revenues, offset in part by lower production costs, during the third quarter 2024.
Production Facilities revenues decreased $3.8 million, or 15%, during the third quarter 2024 compared to the third quarter 2023 primarily due to lower oil and gas production and prices during the third quarter 2024. Oil and gas production declined during the third quarter 2024 due to an ongoing unplanned shut-in of the Thunder Hawk wells. Production Facilities operating income decreased $0.6 million during the third quarter 2024 compared to the third quarter 2023 primarily due lower revenues, offset in part by lower production costs, during the third quarter 2024.
Selling, General and Administrative and Other
Selling, General and Administrative
Selling, general and administrative expenses were $21.1 million, or 6.2% of revenue, during the third quarter 2024 compared to $22.3 million, or 6.1% of revenue, during the prior quarter. The decrease in expenses during the third quarter 2024 was primarily due to lower compensation costs compared to the prior quarter.
Other Income and Expenses
Other expense, net was $0.0 million during the third quarter 2024 compared to $0.4 million other expense during the prior quarter. Other expense, net in the third quarter 2024 primarily includes a charge of $2.4 million related an increase in the value of incentive credits granted to the seller of P&A equipment that Helix acquired in 2023, offset by foreign currency gains related to the approximate 6% appreciation of the British pound during the third quarter 2024.