See the photo
below of Sea Life going into a lock in Panama Canal
and small ship (!) ahead of us. Note the tires (tyres for those that spell propberly) incased in plastic with tape to starboard. These are a requirement so you don't damage the locks.
By the way, when closed up iin the lock we are very close to the ship ahead. When the lock opens and the ship takes off the thrust from their prop can be a taddishly huge. This ship was fine because he knew we were there plus he was fully loaded but they say its a bit of fun when a ship is lite and have the prop half out of the water
cavitating like all hell.
But I do think that the photo
in the ad is pretty crook! They must have had a better pic or 2 in all their circumnavigation
. Unless it was raining for 4 years.....