In the UK on Monday 3 July 2017, Channel 4 have a programme called:  Secrets of your Cruise:   Channel 4 Dispatches.

The write up for the programme says:

Tazeen Ahmad goes undercover to investigate the impact that some cruise ships could be having on the environment and public health, including pollution that some passengers could be exposed to.

Should make interesting viewing.

Click here to go to Channel 4