Underwater Inspections and Surveys

Hi all, I’m maryann. I have a presentation on underwater inspections and surveys. It would be a great help if anyone could provide some information on Ship Husbandry. What are the underwater maintenance services provided for ships? Are the services available 24 hours? Is ship maintenance expensive? Do they use any technologies for this? While searching online on this topic I happen to read this https://asi-group.com/ship-husbandry/ and was pretty informative. If anyone could provide more information about this it would be great. Thank you.