Claims of bullying and disputes over health and safety have led workers at London's Woolwich Ferry down the path of staging two fresh strikes.
Members of Unite employed by Briggs Marine Contractors will walk out on April 18 and 21.
Strikes were held earlier this year before industrial action was suspended for talks, which have failed to break the deadlock.
Unite regional officer Onay Kasab said: "We have worked very hard to reach a settlement on the myriad issues stemming from this dispute, so travellers would not face disruption, but the management's negative attitude has left us with no alternative."
Briggs Marine said it was "extremely disappointed" at the strikes.
A spokesperson for the company said: "We strongly refute all of the allegations being set out by Unite, and throughout this process we have been unwavering in our willingness to hold productive talks.
"Our discussions with Unite continue and if at all possible, we want to avoid strike action taking place.
"Our obligation is always with the health, safety and welfare of our people and our passengers, and we want to ensure that any inconvenience is kept to a minimum."
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