Another company in a similar space, although focused on tidal currents is Minesto.
The problem with wind vs. water is the extreme harshness of the environment. The only industry which has truly manage to tame the ocean is the oil and gas industry, and that at huge costs offset by the high value of what they produce. Not likely we will ever see anything like that in the renewable field.
No affiliation but an old colleague works there so see them pop up from time to time
Salt, water, very strong forces, and a lot of things want to stick to it and build up layers of sand and organic material. And getting trained professionals that can operate in that environment is costly, slow and dangerous.
Beyond those, are there any additional problems from the environment?
The places with strong tidal currents have a tendency of limiting construction to ebb and high tide, in other words lot of expensive waiting around.
Regarding the environment, under the sea it is quite fine compared to stationary platforms operating in the north sea or Mexican gulf(hurricanes) year around, so that should be easier.
The problem with wind vs. water is the extreme harshness of the environment. The only industry which has truly manage to tame the ocean is the oil and gas industry, and that at huge costs offset by the high value of what they produce. Not likely we will ever see anything like that in the renewable field.
No affiliation but an old colleague works there so see them pop up from time to time
https://minesto.com/