Tidewater 8K Other Events | TDW 21 Feb 18

Credit Suisse 23rd Annual Energy Summit Quinn Fanning Executive VP and Chief Financial Officer Jason Stanley Director, Investor Relations February 15, 2018 Exhibit 99.1

FORWARD-LOOKING STATEMENTS In accordance with the safe harbor provisions of the Private Securities Litigation Reform Act of 1995, the Company notes that certain statements set forth in this presentation provide other than historical information and are forward looking. The actual achievement of any forecasted results, or the unfolding of future economic or business developments in a way anticipated or projected by the Company, involve numerous risks and uncertainties that may cause the Company’s actual performance to be materially different from that stated or implied in the forward-looking statement. Among those risks and uncertainties, many of which are beyond the control of the Company, include, without limitation, fluctuations in worldwide energy demand and oil and gas prices; fleet additions by competitors and industry overcapacity; changes in capital spending by customers in the energy industry for offshore exploration, development and production; changing customer demands for different vessel specifications, which may make some of our older vessels technologically obsolete for certain customer projects or in certain markets; uncertainty of global financial market conditions and difficulty accessing credit or capital; acts of terrorism and piracy; significant weather conditions; unsettled political conditions, war, civil unrest and governmental actions, such as expropriation or enforcement of customs or other laws that are not well-developed or consistently enforced, especially in higher political risk countries where we operate; foreign currency fluctuations; labor changes proposed by international conventions; increased regulatory burdens and oversight; and enforcement of laws related to the environment, labor and foreign corrupt practices. Readers should consider all of these risks factors, as well as other information contained in the Company’s form 10-K’s and 10-Q’s. Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc.

Founded in 1955 – Designed the first OSV as we know it today Financial restructuring completed July 31, 2017 NYSE-traded Securities (with 2/9/18 closing prices) Common Shares – TDW $25.51 Series A Warrants – TDW WS.A $3.02 Series B Warrants – TDW WS.B $2.96 Market Cap (@ 02/09/18) ~$765 million, based on 30 million shares and $0.01 warrants Balance Sheet Info (@ 9/30/17) Cash $460 million Total Debt $451 million Stockholders’ Equity $1,041 million 232 owned & chartered vessels (@ 9/30/17) 8.1 year average age for active fleet distributed across global operating footprint; vessels working in all water depths Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. Tidewater Profile

Dealing with a Challenging Market Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. Safety Leadership TRIR in FY2017 lower than last five years’ avg. No LTAs in FY2016 and FY2017 Trusted Partner 60+ years experience in global OSV market Highly experienced management team Committed to Compliance Global Footprint Presence in all major oil & gas basins Invested in local content Minimal Future Capex Fleet renewal complete Remaining construction-related Capex very limited Young, Modern Fleet 146 active vessels / 8.1 year avg. age with 91 owned vessels smart-stacked, 37 of which are less than 10 years old (as of 9/30/17) Diverse fleet capable of supporting all water depths Restructuring Complete Strong post-restructuring balance sheet, with zero net debt Ample liquidity to deal with industry challenges Positioned to lead OSV consolidation Proactive Cost Control Q3 2017 vessel opex down by ~56% and G&A costs (adj. for restructuring costs) down ~47% relative to Q3 2013 Global headcount reduced by 40% Cost-cutting initiatives on-going

Highly-capable vessel fleet One of the largest, youngest and most geographically diverse OSV fleets the ability to operate in any water depth (shallow, mid and deepwater) Unique financial strength Zero net debt post-restructuring Covenant holiday for all EBITDA-based covenants through period ending June 30, 2019 Reduced interest and vessel lease expense (~$73m in annual savings) Positioned for the future Strong, disciplined market leader well positioned for possible OSV market consolidation Industry-leading experience More than 60 years of global operating experience Highly Experienced Board and management team The New Tidewater Prepared for the Future Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. 5 “Tidewater has become possibly the strongest player in the OSV industry and is set to benefit from a gradual normalization in the OSV market over the coming years…” Clarksons Platou Equity Research August 2017 “After emerging from Chapter 11 this summer, Tidewater stands out in the OSV industry with a solid liquidity runway and a net cash position.” Arctic Securities November 2017 “…well positioned to take advantage of the current market downturn through M&A.” Pareto Securities, January 2018

Committed to Safety Leadership Total Recordable Incident Rates CY 2005-2016 (per 200,000 Man Hours) TRIR = Sum of LTA’s and Recordables x 200,000 divided by Man Hours Worked 0.0 1.0 0.5 0.0 1.0 0.5 0.15 10 year average 0.14 5 year average Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc.

Overall working rig count down ~40% from 2H 2014 peak to 420 current working rigs Consensus outlook assumes slow recovery in jackup and floater market beginning in 1H18 Consensus outlook suggests ~ 500-550 working rigs over the next 5 years Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. Market Drivers Source: IHS Markit and Tidewater Working Offshore Rigs 117 257 278 421 Jackups Floaters Note: 25 “Other” rigs in addition to the Jackups and Floaters indicated provide a total working rig count of 420 as of January 2018

OSV Business Drivers – Where have we been and where do we go from here? Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. 6.9 Without ~600 vessels 25+ yrs old 5.9 Without ~1,000 vessels 15+ yrs old Source: IHS Markit and Tidewater 1,000 vessels +15 years old 200 vessels < 15 yrs do not return to service 525-550 working rigs 3.4 4.5 8.3 150 New Vessel Deliveries 4.5 – 4.8 2,400 – 2,500 Active OSVs Market Equilibrium Requires an Increase in Demand and a Reduction in Supply

OSV Supply & Demand Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. Source: Clarksons Platou Securities AS (May 2017) (*includes PSVs >50m LOA and >=1000 dwt + AHTS 4-10k bhp) OSV Supply, Demand and Fleet Utilization Production Support Demand Rig Support Demand

Tidewater’s Active Fleet vs. Worldwide OSV Fleet Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. 146 Vessels 8.1 Years Avg Age 3,500 Approx. Vessels in the Global Fleet 17% Vessels Est. to be 25+ Years Old Vessels 25+ years old today Vessels 25+ years old today Vessels 15+ years old today ~1,000 ~610 Deepwater Vessels Towing Supply / Supply Vessels Other Source: IHS Markit and Tidewater 29% Vessels Est. to be 15+ Years Old As of November 2017 there are approx. 251 additional AHTS and PSVs (~7% of the global fleet) under construction. In our view, a material number of these vessels will not be completed and delivered. Worldwide OSV Fleet Estimated as of November 2017 Tidewater’s Active Fleet As of September 30, 2017 Vessels 15+ years old today 10 21 of Tidewater’s 91 stacked vessels at 9/30/17 are 15+ years old. 0

Global OSV Leader Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. Regional Headquarters Area Operations Americas Active Fleet 27 Towing Supply Towing Supply Towing Supply Our top 10 customers in Fiscal 2017 (3 Super Majors, 4 NOCs, and 3 Other) accounted for 75% of our revenue Revenue Mix Production Support Drilling Support 146 total active vessels with average vessel age of 8.1 years. Deepwater Towing Supply Other Deepwater Towing Supply Deepwater Towing Supply 8.3 yrs Avg. Age 8.6 yrs Avg. Age Europe & Africa Active Fleet 77 Deepwater Other Towing Supply Deepwater Towing Supply 7.1 yrs Avg. Age Middle East & Asia Pacific Active Fleet 42 Deepwater Other Towing Supply

Size and Scope of Operations Matter Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. AHTS and PSVs only, as of November 2017 All Others (~2,400 total vessels for 400+ owners) Source: IHS Markit and Tidewater

Solid Financial Foundation is Key in a Challenging Market September 30, 2017 Balance Sheet Summary Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. Cash & Equiv.: >$460 million Total Debt: $451 million Book Equity: $1,041 million Net Debt/Net Cap: 0% Total Debt / Cap: 30% Debt Maturity: ~$350 million senior secured notes due 2022 ~$90 million export credit backed debt amortizes over ~10 yrs. Source: Tidewater

Go Forward Strategy Leadership in safety, compliance and operational excellence Disciplined cost control, focused on near-term cash break-even Protect and preserve strong liquidity position Focused on growth opportunities with SG&A synergies Deliver best-in-class shareholder returns Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc.

Appendix

New Vessel Trends by Vessel Type – Deepwater PSVs Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc. $44 million, or 42%, of Vessel Revenue in Q3 2017 Q3 2017 Avg Day Rate: $12,157 Utilization: 43.6%

Net Book Value at September 30, 2017 Vessel Count NBV Average Age Avg NBV / Vessel (in millions) (years) (in millions) Deepwater vessels PSVs > 3,800 DWT 42 $ 351.6 9.3 $ 8.4 PSVs < 3,800 DWT 43 $ 175.6 5.8 $ 4.1 Deepwater AHTS 12 $ 66.5 9.4 $ 5.5 97 $ 593.7 7.8 $ 6.1 Towing Supply Vessels 100 $ 234.0 9.2 $ 2.3 Other Vessels 40 $ 9.0 13.2 $ 0.2 Total - All Vessels 237 $ 836.7 9.3 $ 3.5 Credit Suisse 23rd Annual Energy Summit | ©2018 Tidewater Inc.

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